Abusive partner won't divorce?

My guy friend of 4 years, is currently in a abusive relationship for a period of very long time.

He and his crazy, abusive partner fight all the time. His partner is transgender and she/he always accuses him of cheating.

She/he threatens him with self harm/suicide and when fighting my guy friend may have even hitted her.

When asked for divorce, he/she wouldn't agree and is very possessive of him in the relationship..

Any opinions on how to manage the relationship and help my guy friend?

Abusive partner won't divorce?
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