How can I be irresistible to my ex?

Me and my ex broke up, and I moved away, he cheated through text with other girls. But I think my boyfriend didn't want to get back with me because I was too needy and jealous and clingy. I'm going out to stay with him for a week, our relationship is weird...we Brent together but we say we love each other and stuff...but how can I get my ex back? What would make him get on his knees and beg for me back?