Every relationship I've been in has been doomed to fail from the very start. Nowadays, every potential partner has had a few sexual relationships before me. Which rationally, I understand to be natural and no problem.

But for some reason, it drives me insane. I obsess over my partner's sexual past. I picture myself as inferior to those she's been with before. I constantly question her about whether she should "Go back to them", because they're "So much better". I obsess about my partner's previous sexual partners more than I obsess about her. Even when we're having sex, I picture them doing the same thing to her, and her enjoying it. And I know it's not normal. I know I'm fucked up, but I don't know what's wrong with me, or how to possibly solve it.

I get extremely insecure when a partner mentions her previous boyfriends - even just a simple name, or memory they had together. I tend to get abusive and call her names when this happens, even though this isn't typical of me in the slightest.

Every single potential relationship of mine has ended rather quickly, because of how I tend to obsess over my partner's sexual history, and constantly ask questions about it. Is there a word for this? Is there someplace I can go to read about people with similar experiences? What should I even do to fix myself, besides getting drunk all the time?

I already know I have Morbid Jealousy. I don't know if this is an aspect of it or not, but both drive me crazy in relationships.