boyfriend anxiety?

[ChaiTea]

Anyone have anxiety about their significant other dumping them or cheating on them? It comes to my mind every time I'm not with my bf or he doesn't return my call right away. I know I'm just being paranoid, but it causes me a lot of anxiety and I can't help it, I rationalize it and the anxiety continues. I'm worried he's going to get sick of me worrying about it, he's been alright so far, but maybe he'll change his mind if this continues. I feel like I can't help it! Am I having obsessive thoughts?
Anyone have any tips on how to deal?