<human>: I've been w/ my bf for 6months now. 
Last night we were at a house party together & had been drinking..
He insists that our mutual friend [M]has the hots for me..
I don't really see it but, admit that I can be daft sometimes..
Either way..I have never given him or anyone else a reason to not trust me in a relationship..I'm always honest& open..never been a cheater! 
My current BF knows this having been a friend prior to dating for 15 years. 
Long story short..my friend wanted to trade shirts...so I gave him my cardigan & I took his button front shirt for a few minutes...
I did it in the spirit of being silly..
I had other shirts under it..no skin was exposed. 
He insists that I made him look bad & that I was out of line to do this..
I meant no harm & have apologized but, he's still upset..
so ..Did I do something wrong? Am I missing something here or is he being oversensitive ?

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: traded  over shirts w/ another man at party & bf is mad. No skin was shown. am I a jerk?