New to the site, here's why

What's up everyone. New to the site, I am just going to get right to the point.

I've dated this girl now since late March. Our relationship started off with a bad incident. Before we were dating, just going on a date, my best friend came with me. Well she drank quite a bit. No big deal, I am a drinker too. Then my buddy gets my attention, and says to take a look. So I say I am going to the bathroom, but just stood back 5 feet and watched. She has got her hand on his leg, talking in his ear. Thank god for good friends I guess. I brought her home and she cried the whole time, whatever I met up with my buddy back at the bar after that.

I didnt talk to her for about a week, but we started talking after like a sucker, but sure as **** she was super apologetic and swore she was not like that, blah blah blah. Well things have gone pretty well since then. But here's what I got.

If I don't text her after about a day, she will get emotional and think I am cheating. She stays up late every night, but does hang in her room a lot, has some anxiety issues and such. She was showing me pictures she took of me in her phone, but overswiped and there was a picture taken after her photos with me, of her naked in her mirror. I never got sent it. She claimed it was there becaue she was feeling self concious and took it to i guess, analyze herself. She told me her facebook password one night when she was drinking, but forgot she told me it. I remembered it easily, and logged on at some point. I feel low for snooping, but oh well. I did see where after we were dating, she made plans to grab a coffee with an old friend she helped raise his dogs, and she is an obsessive animal lover. But I am well aware that they used to at least have a sexual relationship. I called her out on it, she claimed she never intended to hang out, it was just being nice, and never went and hung out with him. (keep in mind this was while I was working third shift, she wrote my work schedule down). There have been other small white lies that I catch her in. But nothing serious.

Long story short, It seems pretty obvious what is going on here. But I never have solid proof. When I call her out on stuff she swears up and down she is doing nothing wrong and what you would typically hear. There are more details good and bad, but I could write a novel.

Any opinions from any of you? How the hell do I get solid proof, she is too smart to bring someone to my house, and with me working all the time, I will never know for sure. I also dont want to break up with her and it actually be for no reason. I just lack the proof to do so. Thanks.