I am still heartbroken from my ex fiance, but I like this guy I may want ask out?

I am confused. Why are you heart broken over your ex fiance who couldn't make up his mind about how he felt about you, couldn't stand up to his parents and friends regarding your relationship and was sleeping with other girls. He did these things because he was not into you. Therefore, dry the tears and start dating again. Your ex fiance isn't worth pining over.