my girlfriends sister is moving back into the family home where my girlfriend lives. She’s largely a lovely person, but has an absolutely vulgar temper. My girlfriend is having to move out the house to make way for her sisters boyfriend. Everyone is pretty happy with the situation, but my girlfriend certainly feels a little cast aside. 

However, my girlfriend confronted her sister the other night as she won’t confirm when she will moving out. My girlfriend of course needs to know in order to sort all her belongings. I didn’t say a word, as despite me having my opinions on the matter, I didn’t think it was my place. My girlfriend probably knew it wasn’t right to start an argument. 

But then it absolutely erupts. The sister is screaming at and berating my girlfriend about the situation ‘you don’t know how hard my situation is’ as so on. You can feel her just getting angrier and angrier, before she storms out. 

She calls up my girlfriends mum and says she’s coming to take back a gift she just gave to my girlfriend. Bit childish, but whatever. Just like that she’s at my girlfriends room barging in, and my girlfriend (perhaps wrongfully) closes the door in her face. The sister gets in, and a bit of pushing leads to the sister biting my girlfriends hand and holding on. At which point I broke it up, and during the process said ‘wtf you psychopath, you really need to leave.’ Not the best choose of words, but the adrenaline was flowing and I was pretty scared. I apologised straight away. 

My girlfriends hand looks like it has been half chewed off at first, so she goes to the bathroom to clean up with her mum - crying and screaming. The sister’s attention goes to me ‘who the fuck do you think you are’ ‘don’t ever get involved with our family’. She throws keys at my head, whilst I’m still just apologising. My girlfriends brother restrains her and brings her downstairs. 

This leads to more abuse being hurled at my girlfriend, but mostly me. She starts explaining how my family are awful, and more abuse about me getting involved. I don’t say a word, and let her just argue with her dad. Her last words were that all she’ll think about how I called her a psychopath. By the way, my relationship with the sister has always been brilliant up until this point. 

She leaves, and I message her saying sorry. No reply days later. The girlfriends dad apologised, but both he and the other family members (barring my girlfriend and her mum) say i should never have called her a psychopath, or even said anything at all. I do agree, but feel the point of her assaulting my girlfriend, as well as me to extent, is being a tad overlooked. Surely I can’t just stand there and let this all happen - rightfully or wrongfully?!

I have no one to talk to. I don’t want my family and friends to hate my girlfriends family. I just feel so lost, anxious, and hopeless. Have I really done something so wrong?! Is my relationship with my girlfriends family over? How can I live like this when I plan to marry my girlfriend?

My girlfriends hand is fine by the way - just looked awful at first!