How to deal with a toxic person when you can't cut them off completely?

I'm 25f and I had a "friend" that is toxic and I want to completely cut out of my life. we started off as friends, gotten really close over the past few months, ended up having casual sex a few times, we'd hung out 2-4 times a week playing volleyball. It got to the point where we would argue over small matters, and he would get jealous or mad at me when I don't respond.

I got pregnant, it was 7 weeks, and I had an abortion. We mutually decided it was the best option since we were both not ready to be parents, and we were not even in a relationship. I know it was dumb of me to agree to not use protection knowing I'm not on pills. I have learned my lesson, and I took responsibility for my mistake and dumb choices.

He completely ghosted me during the whole process. He bought me the test, and when we found out it was positive he started being mean to me, cussing me, and eventually ghosting me. He didn't help with the fees or even offer to drive me to the clinic. I underwent the process by myself, which was a 4-hour drive from my place and I don't have a car with me so I had to take a Lyft. It was a traumatizing experience for me, plus the cramps and bleeding. When I texted him it's done, he only said "okay that's good. I don't wanna see you for a few weeks tho because seeing you reminds me of the problem. I need some time".

This guy is a close friend of my sister's boyfriend and our cousin. All of us spend a lot of time together. This is where my problem comes in. I don't ever wanna see him or talk to him, but he is a family friend and I don't want to be the person who'll decided who he can/cannot hangout with because that's not my place. But this guy comes back in my life like nothing happened. I don't want him to think that I'm okay with being disrespected. When I completely ignore him, he's nice to me. But when I acknowledge his existence he's mean to me. I want to cut him off, but how can I do that when he's a family friend?

How to deal with a toxic person when you can't cut them off completely?
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