he sounds like a "typical guy" .. and there is your answer... i haven't told any of my friends that i have bipolar... i haven't told my mom and sis because i don't want them to worry...
normally those who have bipolar, they are very bright,artists,intelligent... and we don't like the fact that our illness has stopped us from using our full potential... we were at the top of our game and suddenly because of bipolar we are few years behind, still we keep on trying but we definitely do not want any pity !!!

and as a guy if i cried in front of somebody, even if he/she is my friend i will still be ashamed to face them again... and i wont be able to stop crying when/if i told my mom/sis about bipolar.... so do not make him cry !!!