Probably that's what he's pissed about, but you kind of expected that, right? Yes, take his invitation. Have a great time. There are definitely feelings on his side or he wouldn't be wondering.
I disagree with everyone else about the self-levitating shirts. If he's wondering "if there's anything between us", blowing his mind might be a good idea. Just IMO...
I'm sure you'll make your own choice on that, just like you did with that crazy IM to OW
Me: 30 W: 28 T 8, M 6 S: 7-27-2007 W filed (again) 3-2011 Served 8-2011 Responded, now dark "I have decided to stick with love. Hate is too great a burden to bear" MLK