If a guy strokes his arm over your leg...? ;)?

He may have been flirting but not necessarily. I have lots of guy friends and often times they are comfortable standing very close to me or touching me on accident, just like any of my girl friends would. I would say its a clear sign he likes you only if he made eye contact with you when his arm brushed up against your leg. Or is he seemed especially nervous, turned red or seemed sorry. (A lot of guys that have actually liked me seem to do one of those things if they accidentally touch me.) The fact that he seemed comfortable with it leads me to think that me may just see you as a good friend.