Does your SO's mom like you?

I always see so many posts about their SO's mother not liking them and it always seems so weird to me. I've always gotten along well with parents and a lot of times had mothers try to set me up with their sons. My boyfriends mom didn't like me at first because she hadn't met me she only knew me as the slut who was sleeping with her son (she's very religious). But as soon as she met me we've developed a very strong relationship. She agrees with me everytime my boyfriend and I get in a disagreement and he tells her about it, she calls him all the time to tell him to start saving for a ring, it's gotten to the point where she told him if he ever breaks up with me he's not allowed to bring another girl into their house. It's all very strange for him because she's hated every other girlfriend he's had. Do you guys get along well with your SO's mom or no?