I found out my husband abused his brother and am now getting hate for wanting to break up our family

I was sexually abused my entire childhood by my father. I had confided in my sister about it. My BIL heard me talking about it and last week he said he wanted to confide in me and said that my husband had sexually abused him for 9 years. When it started my BIL was 9 and my husband was 16 and it continued for 9 years. It started with my husband having his brother suck him off and then when he started going through puberty he was putting his privates inside his brother. I confronted my husband and he got angry and said he's in his 30's now and his brother is in his late 20's and it was a long time ago so there is no reason it should be brought back up. He called his mom to tell his mom the his brother is starting drama bringing up old shit. And he was so angry at his brother. I asked my husband how could he do something like that and he argued it's been years since the last time he did that and there's no reason for his brother to be bringing it up. I am shocked and disgusted and want to take our children and leave him. His whole family is saying he made a mistake and he was young and to not break apart our family for his brother bringing up old stuff. I love my husband but one thing I can't love is a rapist. It's not like he was 6 and didn't understand. He was 16 and did this for another 9 years?! My mil is saying she's to blame because she wasn't giving my husband the attention he needed to it's not his fault and is begging me not to break up our family. Saying it with destroy our kids. But I can't love a rapist. I'm destroyed about this. But how am I supposed to look at him and love him the same again. I don't even think therapy will fix this.

Edit: I forgot to add this would mean me and my husband met only a year after he stopped doing it. And he only stopped because his brother went off to college. Which my husband said he stopped before his brother left to college my my BIL said it happened up until he went away to college. But yeah I met my husband a year after it stopped and he NEVER told me this