Why am i so scared of getting hurt?

Every time i start falling for a guy which isn't very often i run away. I over analyse every single little thing he does and have so many bad thoughts, like he doesn't like me much and I'm going to get hurt. I've met a nice guy and i really don't wanna ruin it, but i already am, I cannot stand... show more Every time i start falling for a guy which isn't very often i run away. I over analyse every single little thing he does and have so many bad thoughts, like he doesn't like me much and I'm going to get hurt. I've met a nice guy and i really don't wanna ruin it, but i already am, I cannot stand being like this I have terrible intimacy issues. What causes someone to be like this? Another thing I'm extremely jealous like if i see a picture of him with a girl i get really upset ( I don't let him know any of this) i have trouble with talking about my feelings and stuff. God I'm totally messed up.
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