Your girlfriend needs help that you can’t give her. All you can do is reiterate the fact that you’ve never cheated on her and that you’ve never given her any reason to believe you’ve cheated on her, so you’re not sure where these ideas of infidelity are coming from. Since you mention that she’s had this problem during the entire eight years you’ve been together, you probably know that this is baggage she brought to the relationship — not something you’ve done.
If she can’t work this out on her own, the problem is probably going to get worse.
In other words, you can just be clear with her about where your limits are and hope she doesn’t push you away. 😳
I hope that helps. Let me know how things go, and please follow me @AskAprilcom on Twitter and on Facebook at this link: [url][/url]. 😀