Would like to challenge a couple of your statements so that authenticity is part of your responses moving forward and especially towards your husband.
1) He knows he is very attractive and for some reason this made him irresistible in my eyes.
It's probable you were wayward and unknowingly was ripe to execute an affair prior to meeting your affair partner. Irresistibility is essentially saying, you could not resist. That's not the mindset of a safe and faithful spouse. The vulnerability irresistibility imposes is "checked" by faithful and safe spouses. At the very moment you needed to counter or "check" your irresistibility, you chose yourself and AP and obviously not your marriage, husband and family. AP won. Family lost.
2)Looking back, I should have stopped everything and ended this inappropriate relationship, and then talked about it with my husband.
Actually, you're a little late here as well as insincere. There never should have been anything to stop actually. Stop means something is already moving. The reality is you should not have exchanged numbers in secret. Here's another moment you chose yourself and AP, which is the moment you contacted your husband after seeing meeting his superior and did not inform your husband of the exchange. If you did inform him then I retract this statement. If you did not tell your husband essentially you were telling everyone, yourself, your AP and your betrayed husband you were willing to maintain secret communication with your AP. Your characterization of it being late is off the mark. While talking with your husband would have been better than what transpired, you would still be telling your husband of your choices to engage in secret communications with HIS SUPERIOR.
3)I knew I was wrong but I thought I could control myself
Again, more evidence you were wayward before this moment. The AP didn't make you unfaithful. He was needed in order for your unfaithfulness to be acted out. If it weren't him, it would have been another "irresistible man".
4)For about 5 months we have been having this relationship where we meet 2 or 3 times a week
When you confess it's important convey truth. Don't start out by saying it was once a week when in fact it was two or three times that number. This will hurt him, but it's critically important to provide a number that doesn't minimize your transgressions.
5) Ours is a purely physical relationship
Your husband may see this as your willingness to trade your life, his career, the marriage and family for sex. Sex was your choice over him and the other things. I added his career because you've also placed the burden of having to quit his job to avoid being humiliated by having to work for the guy that had his wife as a toy. Having to leave a company as a professional has many unintended consequences including, but not limited to disruption of career growth, compensation loss depending on if he's able to find other work at or exceeding the level he's currently at. I used to be in the industry and am familiar with sudden and unplanned job change.
6) After that kiss I tried weakly to end our relationship but after a couple of days he came back to contact me by phone and I gave in. After a few days we ended up in bed together.
I can't precisely predict what your husband will be thinking so I'm just going to give you what I would be thinking. It's possible your husband can see what I see.
I would be insulted if you told me you tried to weakly end it. Now, I could see the kiss as making you realize you're entering into a second phase of the relationship, but to suggests you tried to end it would make me furious as I would read it as you attempting to gas light me with comments I might find to be reassuring.
7) I have always told him that I would not leave my husband for him and he has always respected this fact.
FYI......This was music to his ears. It was all about the sex for him and your declaration of devotion to your husband was exactly what he wanted to hear.
8)The point is that right from the start he seems really turned on to do thigs to humiliate my husband, like he always want to meet me at our place and have sex in our marital bed and all over the place, during sex he always trash talk my husband very badly. I am so ashamed to admit it but I have allowed this to happen.
If he tried to humiliate your husband, how do you know this? If he told you, then it wasn't just him that was party to this decision. You approved it as you stated. Again, you chose you and your AP over husband, home, marriage and family.
9) I should never have given in and at least have the decency to respect my husband and son and do not allow this man to enter our house to fulfill his sick fantasies
.
They weren't just his sick fantasies. You enjoyed them and while you didn't necessarily include your fantasy coming to fruition by your bedroom becoming ground zero, this irresistible man was YOUR fantasy and that is no less sick than your AP's fantasy to humiliate your husband while taking his wife in his bed. You enabled your AP's success in the humiliation of your husband.
Your husband will not have a safe harbor to soothe his mind movies and pain. The moment he arrives home he will be reminded of the desecration of his sacred home and bedroom. Be prepared to completely redo the bedroom and anywhere else the sex took place. This may or may not help.
10) My lover turned out to be a lousy and terrible person. A man who stops at nothing or anyone to get what he wants.
You knew this the moment you met him.
Your words:
he's the type of guy that takes what he want.
11) After the last of his ideas I have had enough and I want to end this stupid relationship. I informed him of this and he took it badly. He began to say that he is in love with me (I know very well that it is not true, he only loves himself) and he subtly threatened me to confess everything to my husband.
He loves the sex without complications. You're good for 2-3 times a week without having to be a husband or in a loving relationship. He doesn't want that to end.
12) A man who stops at nothing or anyone to get what he wants. I asked him to leave my husband and me alone and begged him to consider my son and how this could ruin his childhood.From his answers i can see him as a madman right now, how did I not notice it before.
His irresistibility had you mesmerized. How can you expect your AP to respect your potential loss of husband and family when you didn't? Again, he had you in your home. He doesn't flinch at obliterating boundaries because you were complicit in allowing both of you to operate without any being in place. He's just doing what you permitted. He never exhibited respect so you really can't expect him to have it now and especially when you never enforced respect for your husband or you.
13) My situation is a disaster, I would do anything to go back and change what happened. Every now and then I have terrible thoughts in my head and I think my husband and son would be better off without me.
You'll have to courageously meet all of your challenges for an indefinite amount of time.