<human>: Can you summarize the given text in a few sentences?

Okay so my girlfriend and I have been together for two years and everything is fine and it's like we're perfect and happy together and she means everything to me but there's one problem: She hates my past and constantly brings it up which leads to an argument. 

Now my past isn't like me going around and hooking up with random girls. My past includes two girls that I was in a relationship with for a long time[2 years give or take]. My girlfriend hates this because she thinks I still have feelings for one of them and that I care about her, which I don't and I don't even talk or care about either of these girls, and it leads to arguments and I try to keep calm and not get angry and I try to talk to her about it and try to make everything better but it's hard because every week or two I'm constantly told by this girl who I love so much and I do everything for her and care about her so much, that I care about my ex. I know I'm making her sound like she is crazy because she's really not. She's such a well loved person and she's amazing in every way. I just don't know what to do anymore. I can't change my past and there's not much I can do to change anything. I just need help here. I'm sorry if I'm bad at descriptions, my first time posting here so I don't know what all I need to include.
<bot>: girlfriend of two years hates my past, argues about it and gets upset about it, frustrating, don't know what to do.