How these two meet
Everybody who knows the two of you uses the same word about you both, and the word is kind.
That is the whole of the trouble, because you are kind to different things and you have both been calling it by the one word for years.
Cancer looks after the person: what they need, whether they have eaten, what is going on with them that they have not said. Libra looks after the situation: whether it is comfortable, whether anybody is stranded, whether the temperature of the room is survivable for everyone in it.
So Cancer feeds one person while Libra keeps the whole table pleasant, and each of you has privately decided the other one is doing the easier version.
The Moon is the nearest body there is, crosses the whole zodiac in 27.3 days and changes shape the entire way round, in public. Venus never gets more than 47.3 degrees from the Sun and is the brightest thing in the sky after the two lights. One of you cannot hide the state they are in. The other cannot be in a room without adjusting it.
Which is why, when Cancer is not all right, Libra makes the room comfortable and Cancer experiences being managed. And when Libra is not all right, Cancer asks directly, and Libra experiences the room becoming about them, which is the single thing they have organised a life around preventing.
For Cancer, the work is letting the room be uncomfortable for an hour instead of asking Libra how they are.
For Libra, the work is being not all right in front of Cancer and not smoothing it the moment it lands.
The question
Whose comfort has this house been organised around?
One conscious action
one hour, unmanaged
Take one hour in which neither of you looks after anything. Nobody is fed, nobody is put at ease, nothing gets adjusted.
Whichever of you reaches for it first says so out loud instead of doing it. That sentence is the exercise.
The Moon shows every state it is in and Venus keeps the room level, and neither of you chose which of those you were going to be.
Which of you has been all right this whole time, and which of you was ever asked?