what can i do when my boyfriend offers me friendship after brokup coz i want him back.

we were in love happy couple dating for nearly 2 years and he breaks up with me coz he had enough of arguing and he sees no results. now we are friends we talk over phone and see each other once or 2wice a week but he said let see what happins the thing when they progress and we get back together.
in the same time i was dating a new men and his friends saw us and told him that i'm dating he asked me and i told him he was only friend.
now i miis him more than ever what can i do to win him back.