How to deal with getting unfriended on facebook?

[Jace]

So someone who goes to my school added me on facebook and I accepted the friend request, but about a month later I noticed he's no longer my friend. For some reason I'm really sensitive when it comes to facebook unfriends and I never know how to deal with it.. Thinking about it gives me so much anxiety and makes me really depressed. I just can't understand why he would unfriend me when we barely even talked and we were just starting to get to know each other. Can someone please give me advice on how to accept something like this and be more positive about the situation? Thanks.