Don't Blame Other Guys For Your Past Hurts
Sometimes when people been hurt time and time again they develop trust issues. They also develop abandonment issues.
They start to feel that everyone will leave them. They are scared to love and read into everything. It is as if they expect every relationship that they are in to take a turn for the worst. They play the victim part.
If you are in that situation, stop. It is not your fault that guys in the past left you. It is not your new boyfriend's fault or any guy down the line's fault. Your new boyfriend is not your old boyfriend. Just because someone cheated or left you in the past does not mean all guys will.
You can't do anything about what happened to you in the past but you can do something about your future. Start over, focus on yourself and give other guys a chance. As the saying goes "You have to kiss a lot of frogs before you get your prince."