Help me

This happened in my first year in college.

I went to this building to study for an important project I had. I needed a sharpie(black marker) to write on some things. In that exact floor there was an office where the professors offices are at and there’s students who work there. I went to the office asking for the sharpie, there a young man helped me and gave me the sharpie. I got the sharpie and returned to the table where I was studying.

He then not even 5 minutes later comes to me and offered me a soda and he intrudes him. He also told me seen me before because we had a class together but I don’t have classes with him.

Days past by and when I pass by the office he often says hi or just waves. And then I never saw him again because we went on Christmas vacations.

Now i am in my second year and work at that exact office he worked in. I been wanting to ask some professors about him but don’t know if it’s too weird to ask.

Can yall give me advice?? Am I being delusional?? Is it just in my head??😭 can this be red string theory or invisible string theory??