How do I get my guy to fall back in love with me?

I broke up with him three weeks ago because I felt that he needed to be more respectful. He has since had a rebound relationship. He says he loves and misses me but refuses to see me. He says it's going to be too difficult to see me. Every time we talk, it feels like I'm being pushy to see him. He used to be so madly in love with me, but now, it seems like he couldn't care less. I think I'm running him away.