Someone I was dating stopped speaking to me after one of her other partners decided he didn't like me

At the beginning of the year i met a wonderful poly woman online who is married and has other partners. we met in person (we are many states away) and i think we really hit it off and her family was totally welcoming and i felt super at home. As soon as i got back she confessed one of her boyfriends had some issue with me and told her to stop talking to me. so she did. I am hearing from our mutual internet friends that she seems very depressed and is kind of isolating herself. I think he is showing some abusive behavior, and have thought that for some time, but she's blocked me everywhere. What do you think I should do? is there anything I can do from this far away when none of our friends are willing to talk to her?

If she has blocked you everywhere, then that’s a pretty clear boundary that she has set. You can think that this boundary is unreasonable, or that she set it for reasons that are unhealthy, but right now, she has made the decision to stop speaking to you, and there’s not much that you can do about that. And if your mutual friends are unwilling to have this conversation, there’s not much you can or should do to try and push them into being an intermediary in a situation they don’t want to be a part of.

It is so, so painful to know that someone you care about is out there in a bad situation, or making bad choices, and there’s nothing you can do about it. It feels agonizingly frustrating and helpless. I know. But sometimes that’s the place we find ourselves in. It’s okay to feel angry or sad at how things worked out, through no fault of yours, to be painful for you.

She may be in an abusive situation; or she may simply be in a relationship that isn’t compatible with her seeing you - either way, she has decided to end contact with you, and your mutual friends have decided that this isn’t a safe, healthy, or worthwhile situation to try and step into. It sounds like the best thing you can do is try to let go. You don’t have the ability or obligation to ‘save’ her; nor do you have the right to change her mind even if you think the choice she’s made is unfair or unhealthy.