Can abusers change with therapy?

I just found out my twin sister is getting verbally abused by her boyfriend. But to be honest, I think both are verbally abusing eachother. I think I could be wrong. Please no judgment I’m genuinely concerned for my sister.

My sisters bf has a lot of internal issues. He has many problems starting from home. He comes from a broken family. He is always angry and my sister has been putting.

Sometimes just screams at her when they argue. The other day my sister was crying because he called her a bitch. I was very mad!

She showed me texts and I think both were wrong. It all started with her telling her bf to remove a girl off social media so he got upset and caller her a controlling bitch. But then…

My sister posts a pic and he blocks her and tells her she wished she was dead. All of this is getting out of hand. Calls her a mother fucker. Calls her a big turd. Name calls her insecurities like her weight. She then judges his body back. This is getting on my nerves because I hate seeing her cry.

I want to tell my mom but she says he will change with therapy???

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