I admire Jack2 for not taking part in all this overwrought, emotionally manipulative BS that the girls have been partaking in the last few days. He has the integrity to just step to one side, he knows he is better than this. Whatever Laura's insecurities you can't treat people the way she treated Jack2 and expect them to be waiting when you change your mind again.
I think Georgia/Laura/Ellie were very immature. Who needs it? Laura did not appreciate what she had in Jack2. If the genders were reversed everyone would be saying to Jack2 LTB and "right on" for not going back for more of the same.
I like Laura but she needs to be less easily influenced. She threw away a coupling that had a lot of potential by treating Jack2 very disrespectfully. He has enough maturity to know he doesn't have to stick around for that kind of treatment.