I think one of my old friends visited me through a dream

He sat next to me and seemed to notice how much I've changed since he last saw me in middle school. I was very energetic and "annoying" back then and now I'm quiet and anxious around people. I've always been kind of cringe and a nerd, and he was one of the more popular guys. He was nice to me, but I always got the feeling that he looked down on me the way that most people did. We liked a lot of the same "nerdy" stuff, but he liked them in a cool and quirky way while I liked them in a weird way. We talked about those things a lot together in school, but we never got super close or anything. I always thought of him as the guy that was "too cool" for me. 

In the dream, he sat by me and we talked for a few minutes. I didn't say much of anything and kind of just stared down at the floor the whole time. He spoke really softly to me like he was trying to be careful not to scare me. I got the vibe from him that he felt sorry for me and wanted to apologize for something. (For what, I have no idea, he never did anything. At least, not that I remember.)

Intuitively I feel like this isn't just a dream. I believe dreams can be a vehicle for astral travel and travel between realities and windows through which we can look into other worlds. I do believe that dreams can link and that we can communicate and visit each other through dreams. Like another plane of reality that we access when we sleep. I also believe this plane is the same one that we visit when we take psychedelics and can even take a small peek into through meditation. 

I've had multiple visits with my closest friend with whom I've lost material contact, but I never expected to connect with this person. I assume our meeting was unintentional because he doesn't seem like the type of person to believe in psychic practices or attempt them. He seemed just as surprised to see me, too which would make sense if the connection was unintentional. 

Overall a very strange experience.