How can i win my ex back?
I split with my ex, a month or so ago. We’ve been sleeping together still, and i really want him back, but he said he’s wanting to move on 
how can i win him back, without being obvious?
You must stop sleeping with him, if you really want him back now.
Just accept your breakup, limit your contact with your ex for few days. Let him figure out things himself first. Try to contact him slowly but neva look desperate. Do not talk anything about ur breakup.
I cant copy the whole page here, these are few steps which might help you.
http://tinyurl.com/getbackyourexnow
All d best 
