I have had professional help before, and taken things to help with it. Medication does not work for some people, it actually makes it worse I found. The method of dealing with OCD is called CBT which means cognitive behavioural therapy... meaning once you get an obsessive thought you replace it with something else, think positive and forward, and as time goes by it gets easier and easier to do this. It was getting better and easier for me over time but when this person came back in and out of my life it destroyed all that progress. I believed back last year that they had changed, and in many ways I still do believe they did change and they were a lot better person then than they were at our last encounter a few years before that. I never thought this person would get so possessive though... Like I said I find it very ironic that they were over obsessed with me during the relationship but then I catch myself now as the obsessor, but not due to the same reasons...
I should also mention that this person has a child that they had since the first time we were together, which made it even tougher... As it was hard at first when I seen them again since so much time had gone by that I wasn't there for. Also that this girl was the first girl I ever went all the way with back when we first met. I suppose that could have something to do with it psychologically... but I'm not sure. I tried to stick with NC and went a good month with it... but I found myself constantly checking my cell phone and eventually caved in last week and texted them, just regular talk... I said I don't miss the relationship itself but I miss having them in my life just talking and going for coffees etc... and for some reason it put my mind at ease a bit that brief text conversation, I don't know why... I have been able to maintain friendship with another ex girlfriend from about 4 years ago, and THAT ended terribly but me and her are still good friends... the problem I've always found with this girl though is that we have never truly been 'just friends'... even when we have been out of a relationship with each other but around each other we always ended up getting physical and so on, we could never seem to just hang out, and if we could it was only a matter of time until we got back into the other stuff again... I question the possibility of me and this person being able to be friends like me and the ex from years ago I mentioned are