That doesn't sound crazy. While I don't know what this means, I am going through a similar situation. So, I am going to give some context first, and then I will tell you about the dream because the dream would be very weird and indescribable and impossible to understand without this context.
When I was 6, the summer camp I went to for two years shut down, so I transferred to a new camp, owned by the same people. I was bullied a lot when I was a kid, so I wanted to find an empty seat on the bus on the way to camp. I found an empty Emergency Exit seat on the driver's left hand side, and I wasn't strong enough to push it down. A male counselor, who I found out is 10 years older than me, pushed it down for me. We sat together and became friends...whatever that means for a 6-year-old. While I can't say for sure if I had a crush on him (since I was only 6, and I really don't know how I would have felt if a female pushed the seat down or if the event hadn't happened at all), I do know that I loved spending time with him; he was very kind and funny, and I would try to talk to him any chance I could. The summer I was 12 was his last summer there, as he would be too old to continue being a counselor there. We haven't spoken (nor have I thought about him) in 8 years.
Ten days ago, I had this dream that we were talking about our relationship. I don't remember much of the dream, but I do remember him saying, in terms of our relationship, "I am wherever you are," and I responded by telling him that I l love him.
I don't follow this guy on any social media, and, like you, I haven't thought about this guy. Again, I don't know exactly what this means and why people from the past popped up out of nowhere, but if you want a friend you can tell things like this to, I will always be happy to listen.