People with depression most certainly can be in relationships. But not every depressed person intends to commit suicide.

You however are 100% sure that you’ll commit suicide (just going by what you said). In those circumstances you absolutely must inform people you decide to date that’s your intention. Then you giving them a choice.

You said he is veting you if you are a good match (and that’s the right thing to do) but have you told him that your intentions are to kill yourself with 100% certainty? If not, you ought to do it immediately (if you intend to date him).

No it’s not selfish to be depressed or have any other illness on a planet or be suicidal. You didn’t choose it. It would be selfish though to date a person without letting them know. It could be considered manipulative and you can’t build healthy relationship in this manner

Another point is you could get better if you seek help but you mentioned that you cant seek help because you can’t afford it. Do you work? Have health insurance? If you are unable to afford health care that you very much need, perhaps you ought to focus on getting on your own two feet first and get to a place in life when you can afford basic medical care. I’d not focus on dating at this point.

I hope you make a good decision