After going through your break-up you feel like every other guy is going to treat you the same as your ex. Its okay though not every guy is going to be unworthy. You will find the right guy eventually.=)
Pain teaches us lessons. When you put your hand accidentally thru thru a rose with thorns you get stabbed by its thorns and you don't want to hold it again. NOW. This is crucial YOU LEARN. you learn what this pain has thought you. You don't hate. Hate is for the weak ones. The strong one's forgive. Forgiving doesn't mean forgetting. You forgive YOURSELF. Forgive yourself for putting up to the lies. MOVE ON. This is not easy by any means. But it will be worth it. ANYTHING that is worth doing it is hard to do. Just take it one day at a time. Talk to people you love. Do things you forgot doing while you were in the relationship and forgot doing. Be yourself. Love yourself. At least by the end of the day. You have made one person happy. Yourself.
Emotional pain is harder to overcome than physical pain. No matter how bad a physical pain experience could wind up being, it is impossible to re-experience it physically. With emotional pain, we choose to hold on to it for a pay off of some sort. Like proof we are a failure, or don't deserve happiness. The kicker in emotional pain is we impose it on ourselves by choice not because our body is warning us of our behavior could endanger us.
i think its just a natural reaction. one guy breaks up with you for whatever reason, lets say breaks your trust between you and him, and you start to have the feeling that all guys are the same, so then you cant trust any guy you meet. its happened to me before