Nobody photographs footings. The album starts at the walls, and by the time anyone visits, the part carrying the weight is under a floor.
In a relationship the foundation is similarly unphotogenic: who says the difficult sentence first, whether small promises get kept, what happens in the twenty minutes after an argument. None of it makes a good story afterwards.
You can only pour your own half. That is the honest limit, and also the freeing part, because your half doesn't wait on a negotiation. It gets laid on ordinary Tuesdays, by whether you do the thing you said you would do.