Why am I afraid I will lose feelings in a relationship?

Why do I always end things before they get too serious. I’ll have a crush on a guy and when he reciprocates his feelings I immediately lose interest and find him and everything he does as repulsive and stupid? I am also afraid I will lose feelings for him because if he does something not so attractive at some point... show more Why do I always end things before they get too serious. I’ll have a crush on a guy and when he reciprocates his feelings I immediately lose interest and find him and everything he does as repulsive and stupid? I am also afraid I will lose feelings for him because if he does something not so attractive at some point (burp or throw up idk) I will no longer like him. how come I think like this?
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