Boyfriend wants me to apologise for his mom’s wrongdoings and says it’s the only thing that’ll save the relationship. What do I do?

Anonymous
My boyfriend and I are very serious and our families have met many times, we were thinking about getting engaged this year. We both live in our family homes with our respective parents so have to cope with our families’ views a lot. He has a nuclear family when 3 sisters and I’m an only child of a single mum.

Since September, his mum has been (nicely) giving unsolicited advice about her son’s ha it’s and how I should accept him, be less sensitive and not tell my mum bad things about him and his family when they do something wrong. She’s been giving me examples of how great her eldest daughter is too. It’s caused me to resent him over time and I feel like she’s undermining me whilst putting him & his family on a pedestal. I didn’t tell him because I was scared to, and felt that I might be over reacting.

One weekend I stayed at their house and listened to these comments repeatedly, and just broke. Ended up telling my mum everything and there’s been tension between the families ever since.

He’s convinced I’m to blame. I stirred things. I caused drama. I disrespected his mum by telling mine.

He wants me to apologise to his mum, he doesn’t care who’s in the room “my sisters live here I can’t kick them out” and is convinced that’s the only way I can fix the relationship.

I just want to be protected, I don’t think he’s safeguarding me and says all his female friends would apologise in this situation. I don’t think I did anything wrong. I’ve given her the benefit of the doubt, I’ve tolerated things for ages, I was naturally going to tell my mum as I live in the same house. I don’t think I’ve caused problems to the extent he’s made me feel I have. I wouldn’t mind apologising (even tho this wasn’t my doing) but I don’t like the fact he’s okay with having an audience.

I feel like he doesn’t respect me or want to protect me. He also defends his mum and compares her to mine. I don’t know what to do :(
Updates
+1 y
my mum can be a handful, she is a bit negative, so I get their view. I just think the solution isn’t to advise me to simply “not tell your mum, she’s too negative” - a reasonable solution in my opinion would be to not cause problems to start with or tell your son he has some growing up to do.

It feels like they’re manipulating me. By calling me sensitive they’ll break down my boundaries. Also a public apology feels humiliating and sets the bar really low.
Updates
+1 y
I think a public apology with “whoever wants to be in the room” means that in the long run, his three sisters know that their brother won’t defend me. It makes me scared that after marriage I’ll have to constantly apologise to his mum and sisters for things that they do wrong but I’ll suffer for.

I’m really scared. I just wanted to be respected and protected. Not humiliated for other people’s actions.
Boyfriend wants me to apologise for his mom’s wrongdoings and says it’s the only thing that’ll save the relationship. What do I do?
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