What struck me was that when JT was talking to Bobby, he made the comment that "she's my room mate - you don't mess with that", or something to that affect.
I agree with Katherine.....Mac's made it more than obvious that she's interested, and JT's certainly played along when it suited him. They've messed with that roomie relationship plenty - they haven't been strictly platonic roomies since Brit moved out. JT knows that she's always available, and Kay's right - he's using her for a quick ego booster whenever he's in the mood.....intentional or not. My advice to Mac would be "Move on! You're a beautiful young woman who deserves to have a guy who's completely crazy about you!" If he hasn't caught on by now, why continue to play the "I'm with stupid" game?
The writing sucks......of all the guys in Genoa City, JT's about the last person who wouldn't be able to tell if a girl was interested in him, so the way TPTB are playing the "Mr. Dumb" routine all of a sudden is completely laughable!

JMO