I'm not surprised Alex is annoyed if she hasn't spoken to him since recoupling - that is rude.
And, although it is a game show, it does seem rather manipulative to tell him he's her favourite and she wants to get to know him better, then never speak to him again.
I also thought she was awful in their argument - 'you haven't made me laugh' is just trying to blame him for their failure when it's obvious she was never going to fancy him, no matter how many times he made her laugh.