Moms Approval, or lack of

So, I got a big issue.

My SO and I have been together for about a year, we broke up for a few months because I wanted him to figure stuff out, and he did. Over the summer, we got into a huge fight, and I told my mom about it, instantly she hates him, wants me to dump him, and a few months later I did, and we got back together, better than ever.

The thing is, I'm scared to tell my mom. She is very controlling and would guilt me for being with him, and he's terrified to meet her. I want to marry him, and we constantly talk about marriage, and idk what I'm going to do about my mom.