How do I break up with a suicidal man?

So my boyfriend is suicidal and a long time ago I started losing feelings I am scared to break up with him because I feel like if I do he could kill himself. But here's the thing I've lost feeling a long while ago I would have broke up a while ago but his suicidal feeling is stopping me I also have a crush on someone else because he has been treating me right and he knows I like him and he likes me too but I had to say no since I am still with my boyfriend and I'm no cheater no matter what. So y'all what should I do? And am I a D*ck for wanting to break up even tho I'm not happy. I don't understand what to do right now because I am terrified that if I break up he kills himself and I don't care who you are I don't want you to feel yourself if I like you or not and that's the ONLY thing keeping me with him.

How do I break up with a suicidal man?
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