Oh my goodness! A friend of mine just tried to reach under my shirt!!!?

On the bus, I sat next to my friend (who happends to be a boy I've known since my freshman year) of mine that I trusted. Anyway, As I was talking to him, I got a little tired and, since the bus ride lasts around 30 min,, tried to fall asleep. Anyway, a few minutes before I get there, mind you I am still aware when I'm asleep so I know when the bus turns, I felt a hand go from under my coat and to my ! He stopped, and tried to reach for my s under my shirt afterwords. Anyway, I fake a groan because I'm mainly shocked and confused on why he's doing this and he stops quickly and tries to wake me up afterwords. So anyway, I fake waking up a little groggy and say bye to him when I go to my father's van. What the heck just happend!? Is my friend an all time pervert!? Do boys do this!?!? Should I stop being his friend from now on or forgive him but be more wary!? Basically, What the Freak just happend!?!? This is just a friend, not a boyfriend, and now I've just lost trust in! Help!!