Worried about SIL

I’ve noticed my SIL not so happy in her engagement. The fiancé seems controlling. They’ve been engaged for 5 years maybe? Anyways, her fiancé doesn’t have a driver license or car (he says he doesn’t know how to drive apparently and doesn’t care to learn because he has her) so she’s always the one driving and having to take him to work. Keep in mind they’re both 25 years old. Aside from this he can’t hold a job down. He’s been through multiple jobs while she’s been at the same one for almost 8 years. Now that she’s wanting to switch careers and job search he has a problem with it that she can’t be quitting jobs. He openly puts her down when she talks about this. This past weekend I noticed it getting worse. We had a family get together and my MIL brought out family pictures for everyone to look at. He quickly said let’s go you have to take me to go visit my parents now. She quickly was ready to leave and told my MIL I’ll stop by tomorrow afternoon to look at them, and he dismissed her and said no you’re not because I might get off work early and who will pick me up? He’s saying comments and putting her down and this honestly is none of my business so I stay shut. If she comes to me for advice or help I’ll glad help but for now I have no room to speak about her relationship. Also, whenever I call her he answers her phone or if she answers it’d be put on speaker and he’s listening or joins the conversation so I feel like I can’t even talk about myself without him listening or saying something. Then, she told me she wants to go to Las Vegas for her birthday and he quickly said no we’re not because we are going to New Orleans for mine…. Idk I asked my MIL how she feels about this or has she spoke to her and she says as long as he isn’t beating her she stays out of it. But I see a different form of abuse and I want the best for her… someone with a steady job/financial stability… treats her right…. Should I say something to her or just mind my business? She does sometimes stands up for herself and tells him to Uber or Lyft places but he says no because he can just give her gas money and she says it’s not about the gas or money but sometimes she doesn’t have time because she has a schedule and can’t always bend over backwards for his schedule. Another odd thing he does is he invites himself to places…. Like a month ago we agreed to go to the movies. Just myself, SIL, and MIL but the same day he invited himself and it was odd because I thought it was girl time yk? So, it turned into a couples things. Or if you ask her how did you like the movie he’s always speaking for her…. My FIL did call him out the other day and said excuse you I am asking my daughter not you.