why cant i decide what i want in a relationship?

my ex fiance broke up with me 4 months ago and i ended up in hospital twice trying to kill myself a couple of months on im trying to get back in the game and iv been out with a few people but after a couple of weeks i end up breaking up with them.. i know its because im afraid to let myself get close to someone else but why cant i get over my issues i know its not fair on the people i go out with but i cant seem to get over my issues my head is so confused and i don't know what to do i suffer from high levels of stress anxiety and depression so relationships dont work out because of this is there anyway i can get over my issues ?? i want a relationship i just dont want to get hurt
 
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