Do I have relationship OCD?

Hi - I get jealous and obsess re. the guy I like being with another woman. I've done this in the past with other guys, too. Sadly, I think I may have ruined any chance of me being more serious with this current guy.
I try to rationalize my thoughts away, but I can get completely stuck on some phrase he's used, like "I was expecting email" - I think "from some woman!!" or, if he doesn't call me one night, I think he's out with someone. I mean, the truth is, he's not my boyfriend, & he might really be getting mail from some woman or going out to a movie with someone....
But, these thoughts will keep coming at me all day or night, on & off, if I'm feeling jealous. Some of the scenarios I imagine, my sister thinks are pretty out there & probably are not true. (She knows this guy).
Where do I start? I want to stop being this way & to maybe take my friendship with the guy further, if I haven't completely blown it. (He's my best friend, calls me every night, wants to do things with me, but told me that my jealousy & insecurity is a large part of why he doesn't want to date me at this point.)
Thanks for letting me vent.
 
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