I want to call my girlfriend's parents to see if they knew why she was breaking up with me
Will you feel better if you hear her parent's side of the story?
No, I just want to know why she broke up with me. I don't know what I did wrong.
You should not be calling the parents of a partner or an ex without asking your partner first. You should just accept that this happened and try to move on.
No, it might be a misunderstanding and I have to figure it out. I'm going to call her parents.
Calling her parents is just going to make things worse for you. You should ask your partner directly instead of getting her parents involved.