I'm going to dump my high school girlfriend for being suicidal immediately after spending a week with her at a theme park.
Was it because of her suicidal threats?
When I visited her I was really shocked at the condition she was in, she barely could carry on a conversation.
She seems to be suffering and you don't want to be involved with that I understand that, though the timing is a bit odd. You could try to get her help and be there for her first.
She's the one who has to do something about it. I can't accept the roles she is in and what I get in return is some loser who just can't carry on a normal conversation.
You did care for her at some point though, you should continue to care for her and at least try to get her some help.