I don't know if this will help at all... But about four years ago my fiance emotionally hurt me as well, which caused me to have periods of being suspicious and untrusting since then. Every so often, something would trigger me and I'd start dwelling on what happened, trying to figure out why it happened, thinking if I really knew why it happened, I could move past it. But honestly, I already knew everything that I was every going to know about it. I knew why it happened (our issues boiled down to miscommunication and him feeling hurt and mad in his own right, and various other things). But I think I realized something this weekend... When I something triggers me and I start dwelling on this, beating myself up over it, questioning his love, etc, I'm usually already upset about something else going on in my life, not even related to my fiance. But because I already know how to feel about that event, and the emotions aren't new and scary, and honestly, even feels safe and in control to feel that way.... I channel all my energy and emotion into that instead of looking at what's really bothering me. At least, that's what I think is happening because I truly don't have any reason to not trust him now. He's been the perfect mate for the past four years.

What I'm trying to get at is that maybe something else is actually upsetting you or triggering you, but because those emotions feel "safe" you rehash those instead of working on what's actually bothering you. I'm not saying that's definitely the case and honestly, two years ago, I think I was still not ready to forgive and forget. Maybe you simply need more time. Have you tried journalling at all? That's how I came to the conclusion I came to (7 hours of journaling...). I'm sorry you're going through this, and there are a lot of people here who can relate to the pain you're feeling. If you want to talk more, feel free to PM me.

Good luck, take care!