Keeping secrets from Kara, especially when he saw how torn up she was about her, was not a good idea. It was very wrong (and completely unnecessary).
(Also, he uses Winn by lying to him instead of trusting them to actually help him. How can Winn or Kara be okay with that?).
And.. I don't see why or how Kara and Mon El should be a romance post that.
Hopefully, the necklace will have another story; may be he is used to it, or it has to do with Reign or something.
However, I still kind of like him, so I would be happy if he shows growth through the season and they become friends.
Sam: I feel really sad for Ruby.
I liked J'onn and his dad; especially his dad.
I'd have liked a Danvers sisters conversation at the end. Strange that we didn't see a protective Alex calling Mon El out. I guess, they didn't have the time for that.