<human>: Provide a brief overview of the text.

My boyfriend and I live together, and I moved to a new city 4 hours away to be with him here because of his job. We both know very few people here, but have a few people we know from back in the day that we've hung out with, though rarely because we're not that close to them. On his side is a few girls that he knew before we got together. A little back story we've been insanely close friends for 7 years before we dated and only got together in the last 6th months because we were dealing with careers, graduate degrees etc that made it impossible (we both agreed long distance would ruin any future for us). So this group of girls, we've seen only twice and I don't think he's gone behind my back or anything to see them. One of them will periodically text me about getting together for drinks. The problem is, he has slept with her in the past and he lied to be about it when I asked him before we even met up with these girls for the first time. I know for a 100 percent no doubt act that they hooked up (don't ask how, long story and it doesn't really matter). Anyway I don't know what to do...if I confront him with it I have to reveal some things that I don't want to and break another persons trust, but it is seriously making me not trust him. But, at the same time, I do understand why he would lie and would probably at least wanna do the same thing. But I'd like to think I wouldn't. Anyway, am I over reacting? What would you guys think if you were in my shoes?
<bot>: boyfriend lied about sleeping with a girl "friend" that we periodically hang out with. Let it go or confront him?