I think Laura was saying she knew this was going to happen, and wes was saying to jack, that was me. I took it to insinuate that jack has expressed he likes someone else. I assume one of the new girls.
I also think josh is the first guy to really hurt Georgia. I think she was being honest when she said she saw a future with him and wanted him to meet her parents. He of course was off as soon as he got the chance.
It was very different between wes and Laura, because Laura herself said she knew it wasn't right with wes. Plus she's nearly ten years older and been through break ups before.
Georgia did think it was right with josh and was totally taken in by him. I think he knows he came across badly and that's why he's gunning for her, if he can make her look bad, it may make him look more justified in his behaviour towards her.