I had a rather similar situation with my ex fiance, who did not work, who mooched off of me financially, and who was 100% dependent on me in every way. He, too, had had an attempt, was suicidal while living with me and also very depressed. I kicked him out eventually. He was manipulating me 100% into caring for him and taking care of him. He wanted a mother, not an equal partner.

I feel that this guy is doing something similar to you -- manipulating you into thinking he may attempt again if you leave him because he gets depressed any time you say something about how you feel.

Take my advice -- leave him, or else he will continue to suck you dry of every ounce of energy. Or get him to leave, as others have suggested. He needs to stand on his own two feet and you shouldn't have to play "mom". He has to learn to take care of himself -- you cannot do this for him. I learned the hard way myself... please take care of yourself. And you should be able to spend time with your friends without feeling guilty. He needs a life -- you cannot be his entire world in every single way. You're right -- that is not healthy.