I want your opinions. considering talk to someone again

Zena
So my ex recently started talked back with me in the last 5 days or so. The reason we broke up he was smoking weed in front of my friends at his house. Didn't speak to my friends, he was trying to get me sleep over (stay at his place) all the time. Lastly he told another girl he loved her. We dated for 3 months. We stopped talking for the past 2-3 months. I mean no contact. So he told me this yesterday. 
So for now I'm being a friend and hoping he changes for himself and not for my sake. What would you do if you were in my situation?