Saw the trailer at a local theater some time ago:

the main characters are a couple (with a cat i think?) and they are experiencing relationship  problems and kind of a dullness in their live. The woman looked like Annie Clark .                                  The couple kept repeating that they were already 5 years together and at one point the woman told an older woman about it in a dialogue with a meaning like this (roughly):

Woman: I don’t understand, we’re already 5 years together, I mean we’re not at the beginning anymore.

Older woman: 5 years is just the beginning.