Well, I don't know if these are coping methods, but what I try to do is try to change my thoughts to more positive ones. But like I said, I'm trying to think more rationally. The key word here is "trying." Sometimes it works, most of the time it doesn't.
Take my boyfriend for instance. He's just one small example. He has never given me reason to doubt, mistrust him. As a matter of fact, what he does is reassure me, and that is without prompting from me.
Yet, what do I do? Yep. I have these vivid mental scenes/thoughts that he's doing something wrong. And sometimes they come outta the blue! The result is it brings me so much pain! I get depressed all over again. He doesn't know about any of this. A girlfriend tells me I need to concentrate on what he does and says, and I'm telling you I try...you don't know how much I try! Yet it happens and happens and happens.
I think it's a part of my OCD. Nevertheless, if that's true, it doesn't help the fact that these thoughts, not just about him but in general too, hurts! It's distressing, depressing, etc.