close friends after a breakup to gain trust?

My ex an I broke up recently and we want to make it work...the reason I ended it was because he kept making false promises and stopped trying in the relationship. He said to give him a second chance but I told him I didn't know if I could trust his word on "changing". He came up with the idea of ' being close friends, that way I can see if he's changed or not and if I notice no differences we just won't move forward. There won't be no talking to any other people'. Do you guys think I should give this plan a shot? I love him but idk...this idea sounds ehhh..