<human>: Can you give me a shortened version of the text?

My SO and I recently broke up, and although we both agreed we wanted to stay friends things did not go so well. Long story short, even though she repeatedly agreed to hang out she kept ditching me.
Tonight, it all came out because we were supposed to hang out and I drove to her house only to find out that she wasn't there and hadn't really planned to hang out. I knew she had lied about why we weren't hanging out and I stupidly vented to her parents about it.
When I returned home and basically threatened to cut her out of my life entirely, she freaked and wanted to talk right away. I agreed and we talked. I thought things were good, because we worked out our problems and it looked like we could at the very least be friends still.
Problem is, as soon as she got home her parents went off on her. It seems that they believed every word I told them about her lying to me and took that to mean that she was lying to them and was therefore a horrible person. Now they won't talk to her at all.
I guess what I'm trying to ask of Reddit is advice on how to try and fix her relationship with her parents now. It's my fault that things ended up this way, and I feel that it should be my job to at least try and fix it.
I know I was rather vague. If you'd like more details PM me and I'll try to answer any questions you have.
<bot>: Fucked up and might have ruined my EX's relationship with her parents. Looking for advice on how I might attempt to fix it.