Dont know what to do

So me and my ex don't really get along at all (confusing but I still low key care about him I just don't want him knowing that) And he called me night before last for the first time in two weeks, I think he had a little to drink because he told me that he really missed me sometimes and I said "what about your girlfriend" (because he was talking about other stuff as well) he said he was only with her just to say he was in a relationship, well we basically just talked about all different kinds of stuff that night until we finally got tired at 3am so we hung up on each other and went to sleep, honestly after that I didn't expect to hear from him again for awhile. Well last night he called me again to have another conversation, this time he acted like he really cared about his girlfriend (night before he acted like he didn't care at all) and basically he was talking to me about how he hoped I did something great with my life and wished nothing for the best and told me that I need to stop worrying about what others think (because I worry about that a lot) and just things like that, he hasn't been this nice to me in so long and I kind of started tearing up when he said all of that to me. It just sucks because we have so many problems but deep down I still really love him we were together for almost three years. I just don't know what to do and I don't know what he's doing.☹️