About this ?

a few hours ago my boyfriend and i came home to my apartment. I laid him down on the bed and he seemed nervous. We'd had before but this was the first time he asked is that necessary when i undid his belt. he acted so embaressed and nervous. he asked me "what are you doing?" and i tried to grope him and he got up and left. i didn't understand what was wrong. until i found out by his best friend that the other night at one of his gigs i couldn't go to, some losers drugged him, he got high and had pionate with a girl he'd never met in a closet. when the drugs wore off he cried all night in his and his best friend's apartment and took a walk in the morning and came home with red eyes.i'm not mad. i just can't imagine the pain he's going through. what should i do to get him from feeling so guilty and able to have with me again?