<human>: Summarize the given text in a few sentences.

Hello everyone,
I'm realizing I'm having some serious trust issues with my girlfriend. We've been dating for almost three years now, but every now and then, something arises and I find myself acting like my old self. I feel seriously stupid at times. My girlfriend is an awesome girl, i've actually been friends with her before, and it's so stupid but i seriously cannot help how i feel at times, and while I know she would never do something, the frickin thought arises again and again and again for no reason. Some history, in my previous relationship I was with the wrong person and she cheated on me multiple times. Those horrible feelings, feelings of being alone and just being cheated on were terrible. I was in a bad place for a little bit. I think i'm getting better but then recently my gf went out with a friend and I find myself thinking those same old thoughts. I started acting like how I would with my ex if she went out. I love my girlfriend and I seriously need to start trusting her, like the awesome person she is, but I just don't know how to. It sounds so stupid and I apologize if you read this and think wtf man? but i don't know. She's understanding, but I know my actions could be pushing her away. And i desperately do not want to do this, but something is wrong with me. I can't fucking get over the thought of it, even though she is the opposite of my ex. it's really lame and part of me would like to see a therapist or something, but that is totally out of the question, no money, nor time. I don't know what to do.
<bot>: cheated on in the past, with a new girlfriend but still cannot shake the feelings that something just might be going on, even though i know its not. how do i trust again?