How these two meet
Something gets started on Monday with total conviction, and by Thursday it is a different thing with the same name, and neither of you has noticed the substitution.
Aries started it and has withdrawn nothing. Gemini reframed it twice, which is not the same as objecting, and both reframes were better. There is no moment either of you could point at where it changed.
What is missing here is the fixed modality, and neither of you has it. Between a cardinal sign and a mutable one, one of you begins and the other adapts, and nobody in this house is built to hold. Not unwilling. Not built.
Mars runs 2.13 years between reversals and turns without warning. Mercury turns back three times a year and spends nearly a fifth of its life going back over ground it has already crossed. Neither of those is a body that stays put, and nothing you have chosen together is still what it was.
For Aries, the work is finishing one thing in the shape it was started in, even after it has stopped being the best available version.
For Gemini, the work is letting a worse version stand because it was agreed. Say the improvement out loud and then do not make it.
The question
Which of you was going to be the one who stayed?
One conscious action
one thing, unimproved for a month
Pick something the two of you started and let it run for a month with no revisions at all. No better idea gets implemented.
Write down on day one what it is. Read that on day thirty. The gap is the whole subject.
Mars starts and does not look back. Mercury revises and does not stop. There is no third body in this house and there never was.
Between a cardinal sign and a mutable one the thing that does not exist is the one that holds, and no amount of good faith from either of you is going to produce it.