It seems to me that the couple of months you spent together were way more memorable for him than they were for you. He may also be trying to recapture his youth in a way. Either way, not your problem. Harsh? Not really. I'm almost 53 and have had similar experiences with guys from "back in the day." You might just have to tell this guy straight that his comments, etc are inappropriate and that if he persists in being that way...Delete and block. :)