Is it normal how i get over not being allowed to be an aunt anymore?

So, I was babysitting for my sister all the time for a long long time . I got really attached to the kids.But the parents weren't picking them up when I had to work and go places.I also take care of my mom.

So I said I could only do it certain days.I was seeing them m w f, now I do not see them at all.My sister's bf has threatened to hurt me, has people following me around and calling cps on me and anyone who lets me or anyone else on his shit list see the kids.CPS found nothing, But for now I am giving up. Feel really stressed out about this.

Sister's Bf keeps contacting me and saying he is going accuse me of sexual abuse next,and he is telling the kids I hate them and that is why they can't see me.I Am trying to move on with my life, but am having a hard time doing that.I saw the one kid in the store and they said hi and the bf got really angry they said hi to me and said they were in big trouble for saying hello.

I am Thinking of moving.I am not the only family member he is doing this to. He is making the other grandparents bribe him with money to see their grandkids. Apparantly , he did this to his ex wife and is not allowed to see his bio kids,because of it.