Old Heartbreak

I was talking to this guy for a few months at work and we slowly started becoming friends. We were never officially together but we shared mutual romantic interest in one another, at least I think that was the case. One night he took me out somewhere and paid for my food, then we proceeded to hang out in his car for a bit before he had to leave. After that night, he started progressively becoming less respondent, and in the end, ghosted me. Nothing negative happened on that night either, we were laughing and goofing around the whole time. I've been extremely heartbroken over this because I thought I finally found someone who actually loved me. Did I do something wrong for him to ghost me because I'm lost on what happened.