Gg, guys with groups. Gg.

So I'll try to make this quick; there's a girl I've known for just over a year. We've sort of had something going on, and I've let go of side bitches. We are currently just 'friends' as I've told her I don't want her more than that for now, 'benefits' still exist though for some reason. Anyway, we get along well. I've caught her out on a lot of lies before and generally she seems to become more honest every time. I hope she's finally reached the point of complete honesty with me, but I'm not sure. A few weeks ago I caught her getting her tits out for some guy on Skype, and I was disappointed. She says she loves me and only wants me, and it was just a stupid mistake. What do you guys think? Not just about that situation, do you think people can ever truly change or shake bad habits? Be honest, it doesn't matter if I have to lose her.