<human>: So I met my girlfriend last year. We are still very much in love, and I really think she's the one. She is not at all the type of person who would ever cheat or even hurt me. Literally everything there could possibly be speaks against that ever happening, or that if it were to happen to me, she'd be the least likely person to do it. 

The last time I was in a relationship I was 15, and it only lasted little less than a month, when she went to a party and met another guy (she didn't tell me about the guy but told me she'd like to take things slow, and then I found out later). I don't know if it is that, or the fact that it has been so long since I last felt loved by someone not my family, or even the fact that I think she is the one, but every now and then I get afraid that she would do it.

When she is chatting with a guy on whatsapp or facebook (not something she does on a regular basis, it seems mostly school related) I start getting anxious. When she is gone for a significant time (we used to be in an LDR due to living in different countries and meeting in the summer) I get anxious, especially when she goes out with her friends. When she tells me about a guy she used to date starting up a friendly conversation with her, I get anxious, even if he has a girlfriend (although his nationlity, and mine too byw, are some of the worlds most likely to cheat), and I just feel bad for not getting excited for her, simply because they kissed some years ago.

I know this is all my problem, so I don't talk to her about it, but it still keeps bothering me. Do I need to see a psychologist, or are there things I can do myself? Anyone got any advice?

Give me a shortened version of the text
<bot>: I have difficulty trusting my GF even though I know she is very trustworthy, making it my problem, and not hers. How do I deal with that problem?