Honestly, I had an entirely different response until I saw your previous posts about your boyfriend. I don't think this is a healthy relationship at all, I think it's one that should probably end. There's been cheating, obsession, and a boatload of trust issues on both sides; to me that screams END IT NOW.
In one of your previous posts, blahtherapist Michael. had a great reply, one that I think you should reconsider:
Hi Chinadoll,First and most important: No this isn't normal, but it's really good you noticed a problem in your behavior and want to fix it. I think you're having some really bad anxiety or depression issues and they're manifesting themselves as an obsession with your boyfriend. Do you feel these strong anxious feelings when you're physically with them? I'm going to assume you don't. If I'm right though part of the obsession is you're using your BF as a form of self-medication to help with your anxiety/depression issues, and when they're not around you don't have your drug so to speak so the problems begin to manifest.I would recommend you talk to a doctor or therapist and possibly getting a more accurate diagnosis, and from there you can start to address some of these problems more effectively.
I think he's spot on, and that you need to address whatever is going on with you. I genuinely wish you all the luck with this, because I don't think this will be an easy road to go down, but it will be one that's worth travelling.