You know the problem with RAs? They just don't work.
I had one. My (now x) husband wouldn't quit cheating, he didn't understand why we couldn't just move on and sweep it all under the rug, he was tired of listening to me cry over his affair.
I joined dating sites, I just wanted somebody to talk to. Ex literally said "I don't want to hear about it again, if you want to talk to someone so bad, you can go to therapy and shut up." When I tried to see an IC he told me we didn't have the money. I found a guy who I thought was great, he listened to me, he understood, etc. We kept it online for 5 months or so, one night I told him I couldn't deal with my husband anymore, I wanted to drive into a tree, he asked me to come to him instead, and I did. After seeing each other for about 6 or 7 months, I found out he was married, and his wife was pregnant.
My husband knew about the ENTIRE thing. I told him I was looking for someone to talk to, and he said "good, then I don't have to listen to you anymore." I told him that obviously he didn't understand how hurt I was, because I had never slept with anyone else, so, I told him I was going to have sex with someone else, it ended up being the guy I met online who understood me so well. He told me to have fun.
He let the whole thing go on for the 6 months or so. When I found out the OM was married, all hell broke loose at our home.
He didn't understand how I felt, because, he knew what he had done so wrong to make me do that. He wasn't crushed. He didn't have to beg me just to tell him what he had done to deserve that.
He didn't feel more empathetic towards me, he felt I should be more understanding about why people would cheat, since I did.
He got angry and told me he cheated because he knew I would eventually.
Then, he told me he didn't have to do any work on our marriage, because he wasn't sorry. His affair only lasted 4 months and mine was 6, so I was the bad guy.
Then, he was pretty sure OM and I had more sex than OW and he did, so, he used that to justify cheating on me again, to even things up.
Taking the high road protects YOU. If I had just filed for divorce, I could have slept with whoever I wanted, and gotten emotional support and whatever else I wanted. He wouldn't be able to announce to my parents at dinner that I was a cheating whore.
If you want to work on things with your wife, then do so and leave other women out of it. If your wife is not willing to do the work, or if you really need validation from other women, then get a divorce. I'm YEARS out from my ex leaving. (what...5 or6 years now?) and he STILL brings up that I'm a terrible person because I cheated on him. He tells people we got a divorce because I cheated. If I say "you need to think about the kids" he comes back with "and did you while you were cheating?" His cheating is completely irrelevant to him, and has been since day one, the only difference is, I have him ammo to use against me forever, and it works, because I do feel bad and I do think I did the wrong thing, even though at the time, I thought it was fine. Amazing how effective the fog it.