Is it possible to keep someone away from/protect them from another person?

My instincts have been nagging me for days or weeks (or maybe I just stopped paying attention for a while), but I feel like something's going on and I can't see it. Something bad will happen if I don't keep my boyfriend away from his own mother.

Timeline for quick context:

1 - The woman and he couldn't stand each other when I started dating him (long-distance relationship). Even when he was with friends, she would disconnect his internet.

2 - They started talking for exactly two hours straight, and when I got back to the room, he was already angry with me for no reason. She was still cutting off his internet at night.

3 - He lost everything he had, and his mother rose to a high position.

4 - The woman and he reconciled, and she started giving her opinion on what was good and bad about what we were doing in our relationship.

5 - The family who used to mock him (for his career, even though he earned five times what they did) became loving and attentive, always keeping a watchful eye on him.

6 - The family began to involve him, and his wife started inviting him everywhere and buying him things, but if he let her down, she would tell him off.

7 - They pressured him to get a job and told him what to do, but he wouldn't apply because he wanted to get his old job back. Later, he resumed the paperwork process to try to get back the job he loved most, but strangely enough, he didn't get it. He wanted to study something else and was doing well and happy, but something happened, and that didn't work out either.

8 - He gave up and took the job they told him to, and it ended badly. He was afraid to tell his wife that it wasn't for him, and I supported him because I realized it really wasn't his place. Something creative behind a desk wasn't him. His grandmother and everyone else got angry with him, supposedly for letting his mother down. (They don't need money; they all earn triple the normal salary, but they kept demanding it).

9 - In the end, they convinced him to join his mother's company. And he's happy, but he's not the same anymore.

Why do I want to distance myself from him? NOT to distance myself and stop talking. YES to distance myself mentally, I don't know what to call this, but I just want to protect him, so that what she or her family says DOESN'T affect or influence him consciously or unconsciously.

What do I mean? A year and a half into dating him (currently 2.5 years), he kept thinking about leaving the country to come see me, leaving the country to see his father in another country, leaving the country to come live with me in Mexico (this was already going to happen, and it was the last time we talked about travel). What I mentioned before are things he conveniently doesn't remember anymore, but I do, so much so that he got scared because he swears we never talked about those things. He didn't follow through on any of those plans because something happened on every trip: his mother threatening him at Christmas, an aunt who was going to die told him to stay for Christmas, and the trip to live with me (because he couldn't stand his mother anymore and he felt like he was just living with them constantly hovering over him, so much so that his father was fixing up a house for him to move out on his own if he wanted). The trip to live with me didn't happen because his maternal grandmother got cancer and asked him to stay and take her to her therapies. He only took her once, and I never heard from her again, even though I always saw her hanging around the house as if it were hers, even when no one was there. And in fact, he wanted to come a few days before his birthday and visit his other friends here in my country, but it didn't work out.

Now all those plans have become: Come live in my country, it's easier, my family here will take care of you and won't treat you badly. You'll be better off here than with your family (interestingly, I started having a lot of serious problems with my parents a long time ago—I don't remember exactly when—and I lost my job. I cut my hair last year because I had three hairballs that appeared overnight, I feel stuck...etc). My father doesn't like his son being with his mother's family because he says they're all snakes...and that my grandmother is the biggest snake.

I wanted to try something before deciding to leave without trying anything, because if I notice anything strange or witchy here, I don't want to just sit idly by and wonder...What if...?

Thank you for reading this far.

I know these seem like red flags about him, but sometimes the truth can't be fully explained. He's a great man, incredibly loving, attentive, and thoughtful.

I don't have him in person, but we do sleep on video calls, so if there's anything that could help us both, I'd appreciate it.