Should i get back together with my ex bf?

my ex bf and i were going out for 4 months then he broke up with me out of no where becauses he wanted to be single? A week later he texted me asking if i still liked him i told him ya. so we got back together for a month and he was being a jerk so i broke up with him? Yesterday he texted me saying he wants me back and he canchange but thats what he said the first time?
i really dont know what to do??????????? Please comment