I don't think kaz will jump ship either. Georgia might though, she likes sam, but more as a friend I think, he is crazy about her though sigh.
I also don't think Alex is gay, he's just different to the other blokes. I suspect he quite fancies Laura.
Laura's problem is she is attracted to guys that are no good for her. She wants young fit and hot. I personally find it a bit cougarish if I'm honest. She doesn't show any interest in men approaching her own age. She may go after one of the new guys. If they have been watching the show then they probably won't bite, too much crazy/clingy/needy on display I think.
Blokes that age aren't often looking for marriage and babies, especially not on a reality tv show, so if she keeps going after Young fit guys she's going to struggle. Pulling them is one thing when you look like she does. Keeping them is another when you behave as she does.