Trying to decide whether to take my ex back or not
So my girlfriend of 4 years wanted a "break" awhile back, in August. She listed some reasons for it, most of which were pretty obviously bull; I think the main problem was just standard youth/being scared of not knowing what's out there/blah. Plus, we were long distance a lot, which sucked. The point here is that I think it was circumstances and what we were each ready for. It wasn't us not loving each other anymore or anything like that.
Anyway, I was a tad clingy/begging, but only for a couple of weeks or so, then I metaphorically sobered up, took others' advice, and laid off her for the next 3 months. Sporadic contact here and there, but all in all, it wasn't that messy and we mostly left each other alone. Plus, she's always encouraged me to vent and talk, so I don't think that really caused any damage.
Then, over Thanksgiving, we met for lunch and both had a lot of fun, and ended up talking online a fair amount. She says that basically, the guy she's been going out with (started after we broke up) doesn't do it for her, and despite being the opposite of me on most of the practical problems she had with me before, she still finds that she "likes me a lot more," and she can now "see us being together at some point" and even "had times over Thanksgiving where she was asking herself why we weren't just together right now," she "realizes that it was probably just the distance more than me," etc. etc.
I'm definitely still into her, and I think there's a good chance we could get back together and have it stick if I wanted that, but my problem is that she slept with this other guy, and I haven't seen anyone since the summer. I feel like I need to see somebody else too before doing anything with her, or the inequality is going to ruin things in terms of guilt for her maybe, and definitely jealousy for me. The thing is, I don't really WANT to see somebody else. What I want is my ex back, but I don't think I could respect myself or set a good precedent or whatever if I just took her back, scot free, after she was the only one to have sex in the meantime (they definitely didn't fall in love or anything, I'm just concerned with the sex)
Is this unreasonable? Am I unnecessarily burning bridges or being petty and immature by wanting to be with somebody else first? It's very unlikely I'd find anything serious out here where I am with a new person - I'm getting my degree and moving across the country again in June. It would pretty much just be for the perspective and for rebounding/making things even, etc.
I'm not worried about using somebody (I'll make it clear what I'm looking for) - I'm just worried that I'm tilting here and possibly screwing everything up for no reason. Would the jealousy/images go away on their own soon? Would my ex be less likely to take me seriously in the future if I took her back now? I'd go straight back to her like *that* if I knew the answers to these questions would be "yes." Otherwise, I don't know.