<human>: Could you distill the essence of the text into 1-3 sentences?

Help me reddit! You're my only hope!

I've been with my first and only girlfriend for 3 years now. We met in college and have both graduated last June. I've since moved home, 6 hours away from her so we've been doing long distance for over half a year now. 

She's said to me before that she doesn't like my sisters and thinks that they're total bitches to her, but whenever we've been in a situation where she is with my sisters I fee like they don't treat her badly. 

Recently my girlfriend blew up on me and said that if I think the way my sisters act is normal, then she's done with our relationship. I honestly don't think my sisters are bitches toward her, but I don't want to lose my girlfriend. 

Also I told her that she can't go disrespecting my family like that, just like I wouldn't have my family disrespect her like that, which she totally ignored. This happened a few days ago, and we haven't spoken since.
<bot>: my girlfriend says my sisters treat her like shit, I don't see it. she says its over if I don't see it/don't do anything about it.