I feel like Thomas finding fulfillment from his work will slowly chip away at their relationship. I don't think she has the emotional maturity to be happy for him for finding a source of happiness outside of his relationship with her. I don't really believe that he was genuinely upset at the idea of doing long-haul flights but likely that he just said that to her to try to make her feel less insecure. Why on earth would he want to be a pilot if he didn't want to fly across the world? She seems to want the notoriety and prestige ($$$) of having a PiLoT hUsBaNd but doesn't actually enjoy the realities of this job.