1st, what's the reason behind this sudden changes? 2nd, do you have any idea or maybe you've done something that made him ignore u or 3rd, if he's ignoring u out of nowhere, then i believe that it is very immature of him to act like that. what to do? don't mind him. let him realize what he's doing is wrong. never force yourself to be liked and loved by anyone. if they don't like you then carry on...Life must go on even without such narrow-minded people around u. Cheer up!