Overcoming Paranoia?

[BigbucksA]

Ok, so me and this girl have been dating for a few months, I really love her...she loves me too. When we met, it was perfect, we just "clicked". Thing is, she lives far away, but that hasnt been a problem. So, lately, I have been really paranoid about her... Its not that I dont trust her, its not that I don't love her, i just don't know whats been over me. She went with her friend somewhere all day the other day, and I wrote her a poem, and texted it to her. Her friend read it, and apparently, my girlfriend said she said something, and I asked what and she said that she didn't want to deal with my reaction, so I said it was bad, and I asked if she thought of me any less for it, and she said "No, but you will think I do" I told her the next day that I didn't even want to hear it. I find myself thinking the worst stuff, like she had a volleyball game today, and I looked at the schedule online and she stopped texting me because she had to go warm up, 3 hours before the game even started. The first thought in my mind..."Oh my god, shes not going to warm up, shes making out with her other boyfriend before she goes to the game!"

Any tips on how to over come paranoia? I mean, its not just her, I have had the same problem with my exs.....Please give me some advice on overcoming it.