A real barometer of the relationship

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Hey guys,
I'm looking for a movie (or series, not sure) in which there is a scene where two people are sitting at a table in some cafe / restaurant and one person talks to the other, something like: any two people can run together in a park, and later **** like rabbits, but this is not the true barometer of the relationship (marriage?), but this (at this moment he pointed his finger at himself and at the woman in front of it) conversation.
It seems to me that the monologue was led by a man, and in front of him there was a woman who had a disabled husband, although I'm not sure about it.

Do you have any leads?