How do i get back my ex, help needed?

ok, he broke up with me two weeks ago cuz he thought in his mind i was controlling him which is actually not true. he found after a while girl and now he wants to be just my friend. but the thing here is that i told him before we can be friends i need 35 days of break from him (wrote him an email right after the breakup and his decision to be my friend). it seems like he is not taking it seriously. he emailed me 2 days ago saying he was trying to call me and he wanted us to be ok(friends). i sent him a calm email answering only the questions he asked me like i am doing good, etc. and 3 days later(tonight) he sent me another reply saying "thats nice, i just want to be friends at some point, let me know how you are doing". what answer should i write to him so it gets him interested in me again? overall, how should i act?