hes ur ex from hs which ur still interacting w/ until now (college) bcs u both are in a same cof (3 boys 3 girls including u nd him), most likely both of you are awkward woth eachother but sometimes not, the josh and the other 2 boys in ur cof are in a different section while you and the other 2 girls are classmates, one day the 6 of you guys has plans to go out after school so when the 3 of you girls went outside you all saw joshua and the other 2 boys in ur cof waiting for you guys