He came in his pants and now barely talks to me

This guy came to visit me, drove 10 hours and through two different states. We met in person and made out in my bed and he came in his pants (we acted like I didn’t notice).. then we had sex and he last literally 15 seconds and told me I had a “very nice vagina”. (Honestly I thought it lightened you the situation and I laughed) He visited for a whole weekend but I only saw him that one time. Before this we would talk every day and he called me his wife and I called him my husband (as a joke) because we clicked so instantly. He completely ignored me the rest of the time he spent here and now he doesn’t talk to me at all. I don’t understand how we went from being so intimate and connected to nothing. I just want to know why he kind of ghosted me..