I think her behaviour on the camping trip gives a real insight into her personality, she doesn't do well in groups and probably prefers one to one interactions.. possibly boils down to her need for control. Her relationships all appear to be one sided were she dominates. When Sean has been shown to try and stand up to her she emasculates him, he has said he wants a family she says she doesn't, they then get two puppies even though he wasn't a big dog fan, again this looks like her decision. She refers to herself and Sean as mammy and daddy and the pups as babies. She constantly spoke about earning more than him, its not unusual for one partner to earn more but its the context that's important, did anyone need to know that, is it the truth and what's the motivation? All that being said i don't think he'll ever stand up to her unless he meets someone else and opportunities would be scarce.