My old crush who graduated a year before I graduated high school best friend has been

His best friend has been friend requesting me on my social accounts and recently friend requested me on Snapchat. I find it very strange since the only read we know each other or well know of each other is because we had the same class our sophomore well their junior year and my sophomore year. It’s just a little strange and no I know he’s not interested in me because he’s got a girlfriend so idk what it is.

He graduated two years ago and I graduated a year ago. We still follow each other but we don’t really have any contact other than that. We used to be friends but lost touch