Why is my ex boyfriend acting better than when we were together since he broke it off?

We met at a local grocery store and it went from there but lasted only 4, maybe 6 weeks tops (if even that). He broke it off in a text of all things (we are 41 and 42 years old for goodness sake) and I did the normal '****, this hurts, why why? the heck with him he wasnt so great afterall, i will find someone better, etc. routine and as part of 'healing', asked him to meet with me and tell me what I did wrong (where he blamed me for something I had done that he didnt like and where he also claimed he had already screwed someone else) and did the 'we can be friends or FWB's to which I half heartedly agreed to and then he was acting better than ever when he seemed to not have the 'responsibility' maybe. I cant get past how amazing he can be and does treat me (making sure I felt warm and loved after a day out, telling me how much he appreciates my spending time with him and how amazing my touch feels and how great we are together). Is that all just becauuse he is is or knows he can get some from me or could he regret letting me go and is testing the waters to see if he could have me back? I had at one point let him know I had begun dating and he eventually asked me if I was telling him about it to make him jealous because it wasnt working and he backs off and leaves me alone but then eventually makes contact again just when I am about 'done' and not going to go 'there' again with my feelings. This is all just since last August and I just need some words of some kind (other than mean, hateful, get over it type stuff please).