Please answer?! He's upset about what happened in front of my friends. I messed up... Please help?!?

Ok, well, yesterday, I was planning on having three of my friends over for lunch. I was getting everything ready, and I went downstairs to get my shirt out of the dryer (I was just in my bra then) and Patrick got all turned on. I told him we couldn't have right then because my friends would be over very soon, so he went into our bedroom to... take care of things himself... Lol. In the meantime, my friend showed up and we sat down in the living room as Patrick... finished up in our bedroom, which is right down the hall... You could hear him. He didn't know my friends were over yet, and walked out to them hiding their smiles. I kind of giggled, before getting up to introduce him to one of my new friends. I could tell he was frustrated with me for kind of laughing. I felt bad though. So he went downstairs for a while, but later came back upstairs, and my friends, trying to make up for laughing, said, "Patrick, come sit down with us! Tell us about your new CD!" (He's an independent singer/guitarist.) Being polite, he sat down nearby, and I went over and sat on his lap, trying to be nice, since I felt bad... He got a *****... All my friends noticed, again trying to hide their smiles. Now Patrick is angry, saying that all my friends think he's just "a horny, antisocial bas*ard," (He's shy, too, so he didn't talk a lot,) and that I made it worse by laughing at him. I feel really bad, and I apologized a bunch of times, but he's still upset... I don't know what to do! Please help?!?