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Ok so my brother is in a seriously toxic relationship. Everyone has told him to get out of it but I think either love is blinding him or she is threatening him. I don’t know what to do but I want to break them up somehow. This is seriously bad, she mentally and (rarely) physically hurts him. It hurts to see and I need advice!

Damn i feel very bad for your brother. Perhaps try and figure out the issue, it may be due to influence from others or maybe something else, if issue is found then he should try and resolve the issue. but if all else fails im afraid break-up is best option, for he shouldnt suffer through it.