would you date someone who self harms or is suicidal or anything like that?
When someone is that much emotional pain, he or she cannot give to another. For anyone who is not a mental health professional, and even for most who are, dealing with self harm and/or suicidality is very difficult. While you might want to help and nurture this person, he or she really needs professional help. Relationships are hard enough without the fear and worry associated with constantly being concerned about what will happen. I don't think you just cut off a relationship if the person is suicidal, but I would not start a relationship knowing that there are such major problems to start. If you care about this person, tell someone with enough experience to help them, but don't try to handle it yourself.