Dean's problem is that he fixates so much on his hobbies that he isn't as involved with his family as Tori would like. It also impedes his search for acting jobs. Tori actually has 3 problems. The first one is that she internalizes her feelings and then will blow up after all the resentment builds up. The second problem is that she has so many projects going on all at one time, that it wears her down. So her having the swine flu and the effect it had on her is extremely plausible to me. Her third problem, which they haven't discussed on the show, and is just my opinion, is that Tori is extremely controlling. Dean can't do this because it makes her jealous. Dean can't do that because she fears he's going to crash and die. And Dean allows it, though resentfully, I think because he realized he needs to keep his sugar mama happy. Add to that, they have differing views on parenting, like most couples, and that causes some discord as well.
I do think they love each other, but sometimes it seems as though Dean tries too hard to make up for the fact that he cost her her inheritance.
Wow, I can't believe I just let everyone here know that I actually am addicted to this show