Suicidal people really shouldn't be in relationships to begin with...or just need to realize that they probably aren't going to get that attention they're looking for. A good buddy of mine dated a chick who threatened that shit all the time, he left her, she still threatened, he (thankfully) didn't budge, she did nothing in the end. Not to say that some people won't not do it, but it's a fucking shitty thing to jerk a person around like that because your self-confidence is lacking so much to the point where you don't think you'll find another person to love eventually...