Is it wrong of me to not want to be around my sisters boyfriend/baby daddy? *trigger*

So my little sister and I have always been very close. She’s 19 and I’m 21. Well she has this boyfriend they have been together for 8 months now and she’s 14 weeks pregnant. Long story short he has physically abused her multiple times even while pregnant. Last time he did this was last weekend and her neighbor (she lives in an apartment) called the police. They arrested him and she bailed him out the next day. He choked her, punched her, and she has bruises all over her and she still went back to him. I can’t wrap my head around it. This last time I told her to come to my house and I comforted her and talked to her about it all and I really thought she listened and wouldn’t go back to him. Well she did because she said he was drunk at the time and wasn’t in the right state of mind.. Anyways she invited me over yesterday and he was there and I said no thanks. And she asked me why I wasn’t coming around much anymore and I told her I don’t care to be around him. She got defensive and told me if I couldn’t except him than she didn’t want to be around me either because he’s her child’s father so I had to get over it and I was immature and needed to learn to forgive people. Am I wrong for not wanting to be around the guy who abused my pregnant sister?! I honestly think if I see him I’ll end up in a rage so I’m not putting myself in that position.. not to mention when he was beating her she went into a bad asthma attack and he wouldn’t let her get her inhaler and her doctor said that can be really dangerous for her pregnancy. I’m just so worried for her and she deserves so much better. I told her if she was worried she couldn’t do it alone she could move in with me and my husband until she gets fully on her feet but she declined and said her boyfriend won’t do it again 😔