It's going to be hard this day in age to find people that aren't a little messed up in the head. Everybody has their issues and some are really difficult to work with. Your stalker one possibly felt like they were either abandoned by their family or not appreciated or cared for, hence the clingyness. The cutter is pretty much the same as the stalker, looking for attention and needing someone to care enough. The girl with the multiple personalities either went through a severely traumatic experience or was molested as a child. The one with a stalker probably just picked the wrong guy to date and he had that "Til death do us part, remember" complex going. I just want to say that people are the way they are because of what life shells out to them. I find that getting to know these types of people can be truly eye opening and you can better understand the dynamics of the human race and how certain people handle stress and life itself. I know I've learned my fair share of information from the two multiple personalities I've met as well as the dozen cutters and stalkers and other quirky people out there. All these people can prove one thing: that people are really messed up to each other and do cause these traumas upon one another to the point where the victim is now afflicted with sometimes a life long issue that makes it that much more difficult to live a normal life.