It's my pleasure. I'm glad I can help. At this point, I think you may have really hurt his feelings when you 'put him in his place' so to speak. Right now, you will have to change tactics and if you can't outright ask him how he feels or ask a friend to ask him how he feels then you will have to use the oldest language in the book....body language.
When he looks at you, give him a sweet smile and then look down or look away. Compliment him on something he wears, but in a casual manner....put your hand on your chin and say, almost as if you are surprised at the thought " hmm, that shirt looks really nice on you", and then just talk about something else like you never said it. When he said, 'sorry, I'm not taking you', you should have laughed and said, 'you know you want to take me' and smiled at him. Keep a sense of humor about it, and don't get mad at him being petty. Keep a smile and be sure to look at him from across the room. See if you have something he might like, a book, magazine, or something you know he likes and give it to him. "oh, i saw this and thought you might like it' and before he can say anything after you give it to him, change the subject. All of this will throw him off guard, but at the same time, if there was interest in you 'like that' then he will come around.
I'm here if you want to talk more