<human>: Condense the text into a few key points

Hi r/relationships, first time poster here. I have been cheated on multiple times in past relationships (4 times total) and it seems that all of my relationships have ended this way. My current girlfriend [F 20] and I have been dating for about a year now, and I am trying very hard to make it work. However, I've been experiencing a lot of trust issues recently. I have brought it up to her multiple times and she understands that I've been cheated on and that I'm obviously afraid of it happening again. She has told me many times that, "I'm the only person she wants" and I want to believe her, however these feelings of distrust and paranoia of being cheated on again keep coming back. 

I want to be able to fully trust her without having this constant fear of her being unfaithful. Does anyone have any tips or ways of overcoming this fear? I feel that it's really holding me back from putting my all into the relationship. Thank you for taking the time to listen.
<bot>: I have been cheated on multiple times and now that I'm in a new relationship, the fear of it happening again is constant, and keeping me from developing the relationship.