This is not a romance. This is what happens when life goes on, when people grow and fall out of sync. Not out of love; some people are just meant to be. Thomas at least hopes that is the case, even though he sometimes feels like he's clinging to his marriage by a brittle thread.
Frank clutches to the scraps that are left, knowing he's the root cause of Thomas's grey hairs, their kids being hormonal monsters and his own sanity being questionable...