How do I seduce my ex boyfriend?

F 25 and ex boyfriend M29 have been broken up for two months and a half.
He is of course seeing other women at the moment.

Our relationship had a lot of ups and downs and I have pretty much messed it up at the end. However, my feelings for him did not change not for a single day since the breakup.

I’m trying to get him back again and I want to start this by re-seducing him again.

It seems as if he is building a wall between him and i at the moment, and i am not very sure how to handle the situation without being rejected…

Any advice?