If a guy is embarrassed and he is crying and he is talking to his mate and you walk past he looks at you and turns around is he embarrassed?

Probably he is embarrassed.

Most likely doesn't want you to see him crying.

he doesnt like when people look at him when he is crying

LOL HES MOST LIKELY EMBARRESED BECAUSE HE WOULDNT TURN AROUND IF HE DIDNT CARE WHO WAS WATYHCING LOL