You need somebody who can keep up
Mercury in Gemini points its questions at the 7th house, so the person opposite is the condition of your thinking rather than an audience for it. What you want from a partner is a mind that moves at your speed and takes the topic somewhere you had not planned.
Everything else is negotiable. Kindness, stability and shared plans all matter, and none of them will hold you in a relationship where the conversation has stopped being interesting.
The agreement was made in a conversation
You settle terms by talking and both of you leave certain of what was agreed, sometimes differently. Nothing was written down because the exchange was so clear at the time. Put the specifics in a message afterwards, in three lines. It feels unnecessary between people who understand each other and it is precisely between such people that the misunderstanding does most damage.
Two people, or two arrangements
This position tends toward plurality: two significant relationships across a life rather than one, or a partnership running alongside a close friendship that carries an equal share of the weight, or a business arrangement conducted in parallel with the personal one. None of that is instability. It is a genuine need for more than one channel, and it works far better acknowledged in advance than discovered halfway through, because discovered it looks like something else entirely to everybody involved.
When the talking stops, you assume it is over
A quiet period in a relationship registers to you as decline, and you begin looking for the exit while the other person is simply having a busy month. Ask before concluding. Some people go silent under load and return unchanged, and your reading of the silence is the least reliable instrument you own.
You argue both sides for them
In a disagreement you can state the other person's case so well that they feel represented and slightly outmanoeuvred at the same time. It is genuine empathy and it can function as a technique. Notice which you are doing. Restating their position in order to move past it is not listening, however accurate the restatement was.
You do the talking, they do the following through
The professional pairing that works for you is complementary rather than similar: you handle the pitch, the client and the explanation, and somebody else handles the delivery and the detail nobody else wanted. Find that person deliberately and agree the split formally rather than letting it settle by habit. Two people with your profile in the same arrangement produces a very great deal of conversation, a quantity of extremely good ideas, and remarkably little that anybody could point at afterwards.
Choosing one and staying is the practice
You can sustain interest in a person indefinitely and you can also always see the version of your life that took the other route. Both remain true, which is why the question of commitment never resolves itself by argument. It only resolves by decision. Make it deliberately once rather than leaving it permanently open, since the open version quietly costs the relationship you are actually in.
You process it by talking, and then you do not sleep
Difficult exchanges with somebody close stay live in you as language: the conversation rerun, better versions drafted, three arguments still open at two in the morning. Nothing settles until it has been said out loud to somebody. Get it out of your head and into words within the day, even to a third party, because unspoken here means unfinished and unfinished keeps you awake.
Say the unclever sentence occasionally
Your affection travels as wit, reference and rapid exchange, and a partner receiving all of that can still be uncertain of the plain fact underneath it. The unadorned statement is the one register you skip. Use it once a fortnight, badly, with no joke attached. It lands harder than anything clever you have ever said to them.