Everything you're saying sounds familiar...the anger, the sadness over the loss, the "meh", the observing other women.
Time apart, 3 weeks while he was with him family overseas, actually helped us a bit. Things were so intense that first year, having some space to just reflect in our own spaces was beneficial. And, like it or not, the W needs support too. Being with his family, while they condemned the A, provided him some space to be around friends and family who would love him no matter what even if we divorced. He needed that. The guilt and shame he carried was heavy. He deserved to carry it, but it was heavy. And, watching the effect his decisions made on me, our son, and our marriage....was equally as hard as what I was going through. It took time for me to realize that.
Like the other poster, my FWH did all the things - read everything, organized IC and MC, and did everything he could to help me heal....although, eventually healing was something that only I could do for myself.
Please take care of yourself. Healing yourself from this will take longer than anyone would like. Healing your marriage, is a separate issue altogether. I never committed to staying or going. I committed to working on it, but only if he drove that bus. I was not going to be in charge of making those counseling appointments or dates. It needed all my strength to get through the day. If he hadn't honored that, I don't think our marriage would have survived. I, too, asked for and received a signed post-nup. I wanted those issues off the table so that we didn't have to think about them and we could focus on whatever "working on it" looked like. There was no new affair behavior, and he did do all the things, but he wasn't perfect. Neither of us were.
It is a marathon, not a sprint. AND, infuriatingly non-linear. My best advice, focus on you, take care of you and your kids.
We're still here. It's almost 6 years. Our marriage isn't perfect, but it is so much better than it was.