Negative thoughts of loved one's safety, iin?

Me and my boy friend have been in relationship for over 2 years. we have been in a long distance (a day's travel) relationship since the beginning. I was fine for over a year later i moved to another state and the distance increased. I started feeling very much worried about my boyfriend's safety. i get worried when he does not pickup my calls. i get worried if his mobile phone is switched off. i just keep calling till he picks up the call. if he does not pickup my call for a long time, i call his friends.This is all fine for a while but it is now going over my head. i feel like i am loosing my self. My boyfriend loves me a lot, and tries not to make me feel bad about how i am. i don't want him to feel being controlled.

I want to give him space in the relationship. But i just cant control my thoughts. Its has really started to annoy me as well as my boyfriend. we have more fights these days all because of my obsessiveness. I thought of taking a break from the relationship but i cant be without talking to him knowing that he is safe. I am loosing myself in all this..Please someone help. I am going through a very tough time.