Plz i need opinions .. help .. 10 POINTS?

one of my good friends that have really special place in my heart and i think he has the same feeling for me but he has an ex that can't get over , and me 2 :( so we're just good friends ... i know when he feels lonely he'd just go for a walk alone and think abut himself so i saw him last sunday by accident walkin' alone in the street and he saw me and ignored me then he went home and now it has been 4 or 5 days he didn't open his MSN so o u think there's somethin' wrong with him ?? like he's havin' a trouble or somethin' ?