What do you do when a guy you kinda know cries?

If he will let you comfort him by a hug then give him a hug but if he turns away just tell him you are there for him if he needs you. Don't bring the situation up as guys do not like to cry especially in front of girls. When he is done crying just carry on and talk about things unless he wants to talk about it - let him open up to you if he wants don't push the issue.