<human>: Could you distill the essence of the text into 1-3 sentences?

My fiance and I have been together for 8.5 years. We have a 2.5 year old daughter together. Shortly after we had her my mother moved in with us. It wasn't a situation where she solely moved to help us, she lived with my sister who was being evicted from her apartment. Part of the arrangement, however, was that my mom would watch our daughter when I went back to work. 

Ever since my mother moved in with us my fiance has been a complete asshole about her. I admit she does a lot of things that annoy me and lies a lot but I never thought it was serious enough to hate her. He's pretty reserved in front of her but the things he says when it's just us are what gets to me. 

For example today is my moms birthday. It also happens to be his moms birthday who passed away a few years ago. During an argument we were having he so casually made the comment that my moms birthday doesn't matter to him and that he wouldn't really care if she died, he would just feel bad for me. This isn't the first time he's said this either. When I made a comment about how wrong it was he simply said she "did him dirty." All because of some comments she made in the past.

What bothers me most is that my mom has always been there for him even when his family wasn't. In his eyes he's made up for it by letting her move in with us and by us helping her with some things along the way. 
I honestly love this man and want to have a future with him but I really can't see what kind of future we'll have if he keeps making these types of comments. I'm tired of feeling like he doesn't give a shit about my family. He never wants to talk about it and when he does he makes everything about himself. I don't know what to do anymore.
<bot>: Fiance constantly makes rude comments about my mom. I'm sick of it but don't want to lose an 8.5 year relationship.