Most Helpful Girl
I would feel sad but not guilty. That doesn't seem that he's in love instead he seems obsessed. Also the false idea that he has to be with the perfect girl is how society has constructed us to be so I wouldn't feel guilty. I'd blame what this society teaches people. I personally would ask him to leave me alone and if not then put a restraining order on him. If it ever escalates to that I'd consider it stalking and to kill yourself over someone is not love, its obession.