A real breakthrough in improving my (non-infidelity impacted) marriage was once when I thought my wife had given up on me. I realized that there might be things like the kids, pension, mortgage, history and all that making leaving me hard, but that none of those were really good reasons to remain. At some point my behaviors might make her chose to handle those issues rather than MY issues.
This is mutual: The ONLY reason I am married to her, and the ONLY reason she is married to me is that we chose to. It’s a decision. It’s not even mutual, but it’s two independent decisions based on both being in agreement.
We have discussed this...
We realize that our strong marriage is actually delicate. If we don’t show each other respect, mutual affection, mutual freedoms, mutual support... one of us might start wondering what there is to hang on to.
This isn’t shallow. I don’t start each day wondering if my commitment is still there. But I do regularly – like several times each week – wonder if I am showing her that my decision still stands. I do that by showing respect, sharing chores, taking care of business, holding her hand and so on.
I mention this because I think we – couples that have gone thought betrayal – should be ultra-aware of this. You can’t be the marriage police, and if he wants to cheat or whatever... there isn’t really much you can do to prevent it – but you CAN refuse to accept it.
What I would suggest is the following:
Let him know of your concerns. That if he’s spending this much time elsewhere or away you are afraid he might go back to wandering outside the marriage. Tell him that you realize that you can either let it drive you crazy, or you can accept that he might do it... But that the only clear thing is that you won’t ACCEPT it.
Tell him that if he cheats it will come out. It might be that you sense his demeanor, note the missing cash or card-charges, pick up on the phone-calls or even when he starts avoiding sex to hide the STD tickling his balls. Whatever.
It might not come out the week or even the month it happens, but it will come out. And when it comes out it will make you fully realize that no matter how much you might have wanted the marriage to work... it won’t.
It won’t work due to the disrespect he’s showing with a repeat affair, the risk he is placing you in.
Then allow him to tell you – and show – what assurances he can offer. If it’s "only" his word, then fine. But if he’s honest he will offer other assurances ranging from access to his phone and media, check-ins, location services and such.
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To use an escort (I prefer using the correct term of sex worker) you need to pay. In fact – escorts are usually "higher" quality (in the sense that they aren’t as badly off as the abused, drug-using street workers), but it’s actually like calling a fried egg an omeleté – basically the same thing. One way to monitor him AND it’s also a great way to improve the marriage is by sharing accounts and setting budgets and financial goals. You see cash-withdrawals for $$$ and you can safely assume it’s not for a quick meal...