Girlfriend Dumped Me Because Of Her Parents. What Can I Do to Keep Her? PLEASE HELP!?

Anonymous
OK so here's the deal guys. I was a senior in college and just recently graduated in 4 years with a job offer that requires me to move 11 hours from my hometown. My girlfriend is also in college and she's about to be a senior also.

We have dated ever since high school with one bump in our relationship my junior year in college where she left me and after 2 weeks of not talking to her slept with one of my ex-friends. After that happened we got back together and been together ever since. She has been closer to me ever since her "mistake" and said that she loves me and wants to be with me forever. I love her too and want to be with her. However, her parents dislike me somewhat because I have a mother who is mentally unstable and freaks out about the littlest things. She has yelled at my girlfriend in front of them and ever since they haven't liked me. I am nothing like my mother. Her family is also well to do as they have a lot of money and my family is considered just a little above upper class. Ever since then we have dated secretly. Today, her little sister who is spoiled beyond disbelief told her mother we were dating and my girlfriend called me and said we couldn't go out anymore. Now her mother didn't forbid and say she couldn't date me but she was really disappointed and sad that my girlfriend was dating me. My girlfriend loves her mother very much and whenever her mom gets sad about something she does, my girlfriend will take her side. So my girlfriend ended up dumping me today. I just don't understand why my girlfriend's parents are so judgmental and why her sister hates me so much because I have never done anything really wrong. They have supported her dating a guy after she broke up with me once who was worse than me as he was caught smoking pot by a drug test. However, his family is pretty wealthy too. I don't know what to do anymore or what actions I should take. What do you think? Please Help!
Girlfriend Dumped Me Because Of Her Parents. What Can I Do to Keep Her? PLEASE HELP!?
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