My Separated Wife is Cheating on Her Boyfriend with Me - Advice?

So I need some feedback, guys. I've been separated from my wife since July of last year when she told me she wasn't happy anymore. A lot of it was my fault, based on my drinking problem. After separation, I continued to drink for 2 more months. I then decided to turn my life around and quit drinking altogether on September 24. Since then I replaced my drinking time with gym time. I've gotten really fit and get lots of attention from girls now. It's strange to me considering I've spend most of my life being rejected by women. So that's new to me. Here's the thing. After the wife and I separated, we still continued to hang out, smoke weed, play cards, and have mind-blowing sex about every other weekend. If there was one thing we were NOT lacking in with our 10 years of marriage, it was INCREDIBLE sex.

Last night, I got to her place to smoke some green, hang out and have some awesome sex. But shortly after I arrived, I noticed her phone was open to a text thread on the couch. I tool a peek and saw messages to a guy named Luis and saw messages like, "I love you, babe", "wanting to see you later" and "please do" from both sides. I still went ahead with our plans but I'm confused as to whether or not I can justify being bothered.

Divorce papers have never been filed because I didn't want a divorce in the first place AND she's not asking for them. I do still secretly hope that we will get back together one day. We still have an amazing relationship, but without the closeness of an actual marriage. I look forward to the little time I do get spend with her (overnight stays and such) and don't want to potentially have that end. But the idea of another guy kinda bothers me.

I'm confused for two reasons: I don't like the idea of another guy. But I also find solace that she's fully capable of and actually cheating on her boyfriend with me.

She does NOT know that I know about Luis.

Should I just continue to let the good times roll?
My Separated Wife is Cheating on Her Boyfriend with Me - Advice?
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