I'm losing friends, I barely have any left.... i need help

My girlfriend and I both have horrible, verbally abusive dads. We both have indifferent mothers, siblings who don't care, and we both cut. We both have each other...but sometimes I wonder if that's enough. We both have depression, her's is untreated, mine is treated though my meds don't work at all. I can tell I'm the reason she keeps on going through life. But how can I be, when she's the reason I keep going. When I have two ex's that still like me and despise her for being my girlfriend? How is...