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I (35f) think I need to end my relationship to (35m) but he's in mental health crisis
A person who is freezing to death because they refused to put on a coat is in crisis, but that doesn't make it your responsibility to light yourself on fire in order to keep them warm.
No matter what you choose to do, things are going to be difficult and awful for a little bit. But one path is going to lead to you eventually feeling a lot better, and the other path is going to have you marching around in circles and not really going anywhere at all. Your choice is whether to endure some really shitty times for things to get better, or to ensure some really shitty times for things to stay more or less exactly the same as they have been.