stay away from psycho guys

Now tell me that or enlight me, is it ever possible that staying away from psycho guys? It seems like most of the guys I have been with or the ones I fancy or like or god knows what I felt are the proved psychos in the city, region, maybe entire world :P (ok ok I accept it is too much) Do not know why I keep fallen for them over and over again but I just want to not to be a psycho magnet again!!! So help me out of it, is it ever possible :)?!?