After the elevator incident, it was like Lea was intentionally provoking Carly during the karoke scene. Like someone mentioned above, the skanky way she was acting with dude on the dance floor, then comes over to Shaun & Carly, screaming Shaun's name - just acting like a total jealous witch.
I also agree with CarpeFelis above, she really doesn't want Shaun as a lover or the special man in her life, but she doesn't want anyone else to have him either. If he's unattached, she can manipulate him all the more. That's why she resents Shaun and Glassman's relationship.
Carly and Shaun did not have any chemistry whatsoever and I'm glad it's over. She poured everything into making the relationship work and it wasn't enough because Shaun isn't in love with Carly. He's in lust with her now that he's no longer a virgin. He has always loved Lea who doesn't love him back. She does things to hurt him, upset him, disappoint him and it doesn't phase her one bit.
I hope she breaks his heart in a gazillion pieces and leaves the show for good. Maybe then the show can get back to letting Shaun be "The Good Doctor" the show is designed to be about.
They need to give Claire a nice boyfriend, who is not a doctor, so she can move on. It's apparent the writers are trying to hook Claire and Melendez up and it would be a disaster for the show. Look what happened with Lim & Melendez. The writers now pretend like their affair never happened.
It a good show without all the sexual antics and boyfriend/girlfriend stuff. I like that Resnick has an issue that has nothing to do with a man or a romance. They made Claire out to be a $2 hooker after her mom died. Why I don't know. It didn't fit in with anything. Claire is always the punching bag for this show and I'm kind of tired of it. If she and Melendez hooks up, we know who's going to be left holding the bag.