I don't know that we have seen a different side to Jack.
We know he's slept with a lot of people. He's only had two girlfriends, of which she wasn't one. We haven't seen any bad behaviour towards Dani. At all.
My dh is a nice bloke, not in any way a fuck boy, but even he had a girl I encountered at the start of our relationship who he hadn't treated well. But when a decent bloke meets a girl he likes, he tends to treat them differently to the others. There's a lot of truth to the expression "he's just not that into you". Doesn't mean a single bloke or girl see people and/or have sex.
I do think he made a bee-line for Dani when he came in, yes, but I think he just fancied her. I'd say every one of the people going in looked at her Instagram.
Georgia did let herself down a bit this evening, but she had obviously been drinking, she's only young and she feels embarrassed and hurt as she had let her guard down. I'd say she's always been in control with boys before and now not only was she not in control, but she's been humiliated on national tv in front of millions. Cut her some slack.
Poor G. 