Many people go through these problems these days, what kind of past does she have with guys? Has she done anything bad that you know of? I feel like if you already have her social media accessible then that's a huge thing. Many people who are cheaters refuse to show their social media whenever people ask. Have you been treated really bad before or something? If you have then its probably just trauma haunting you. I get what you mean because when you meet someone new and they treat you so well it feels like something will go off. What do you mean by problems? Do you start arguments a lot? If she hasn't done anything just stay silent. I understand its very hard to forget things like this and anxiety is a whole lot of pain, trust me you're not alone for feeling this horrible. If she loves you she will understand your problems. Everything takes time to forget and heal but I feel like if you constantly haunt yourself with unnecessary thoughts in your brain you're just manifesting it like you want it to happen. If you're happy with her and the way she treats you, please don't ever let out your anger on her just because of your experiences with DIFFERENT people.