I’m sure Jean and Scott still love each other and are intimate with one another, they aren’t cheating, they just have an agreement with an open relationship. They felt bad about all the kissing and butt grabbing in front of Emma and Logan so now they have agreed to spend time with both of them on the side. Emma just has more class and self respect so she keeps her own place on the island and makes Scott go to her; while Logan is more than happy to stick around in the guest house waiting for Jean to give him attention while he drinks Scott’s beer.