A question about jealousy?

I have a friend who until recently was very kind to me, and I got on very well with. Nothing in particular happened between me and him-we just haven't really spoken as much recently. I feel an incredibly intense (and possibly even obsessive) sense of jealousy about this friend, as he has been interacting more with other friends he has over me. I know it sounds incredibly petty, but I feel like this ties into my diagnosis of Obsessive Compulsive Disorder, possibly, in that I've been having daily, constant thoughts about this (hence why I described it as "obsessive"). I have almost no friends at all aside from this person, so I feel like maybe I've formed a bit of an unhealthy attachment as a result. 

What I want to ask, is if anyone else here who has been diagnosed with an autistic spectrum condition (I have Asperger's Syndrome, for reference) have particular issues with jealousy? If so, how do you respond to such feelings? I really want to just leave these horrible feelings behind, but I can't help but remain attached. I apologise if I'm quite vague, I find articulating my emotions very difficult.

Thanks for reading.