You need somebody you can still surprise
A Gemini Moon in the 7th house is held by conversation rather than by routine. What settles you in a partnership is a mind that answers back, notices things, and gives you something to think about, and a bond conducted mostly in comfortable silence goes quiet in a way that troubles you.
So the test of a relationship here is whether it remains interesting. Not exciting, which is a different requirement, but interesting: somebody whose thinking you are still curious about after a decade.
The daily exchange is the relationship
Messages through the day, the debrief at night, the running commentary shared with one person: these are not incidental to your closeness but the substance of it. A partner who stops supplying that will be experienced as absent even while entirely present. Say that plainly, since it looks like a small preference and is not.
You talk your way into understanding them
Where other people intuit a partner, you interview one: the second question, the observation offered to see what comes back, the willingness to keep asking. Over years this produces a genuinely detailed picture. It also means an evening of silence from them leaves you with nothing to work with and inclined to fill the gap yourself.
Restlessness arrives once the person is known
When there is nothing new to find out, your attention starts looking elsewhere, and the wandering usually begins as curiosity rather than as dissatisfaction. Notice that the feeling arrives on a schedule rather than in response to anything. Somebody you have known for years still contains a great deal you have not asked about.
Keep changing what you do together
The novelty a long relationship needs can be supplied by activity rather than by people: the new course taken jointly, the trip somewhere neither of you knows, the subject learned together. This works reliably here and it is much cheaper than the alternative solution your temperament tends to reach for on its own.
Attraction begins and ends in the talking
You fall for how somebody thinks and you leave when the conversation dries up, which makes intellectual compatibility a practical requirement rather than a luxury. Physical chemistry alone will not hold you for a year. Say early that you need to be talked to, because most people assume that is a preference and for you it is the mechanism.
A best friend in every phase of your life
You form intense one-to-one friendships that run for a few years at high frequency and then settle into something quieter as another one starts. Nothing about that is disloyal and it can look like it from outside. Keep two of the older ones alive deliberately, since your natural pattern is to let them fade rather than to end them.
You need a partner who does the parts you drop
In business the ideal counterpart is somebody organised, patient and unbothered by detail, because you supply invention, contacts and momentum and reliably lose interest at the administrative stage. Choose for complementarity rather than for agreement, and write down who owns what at the start, since neither of you will remember it accurately later.
You get on with their relatives instantly
A partner's family finds you easy: interested, conversational, willing to talk to the difficult uncle. That makes you an asset at gatherings and can leave you carrying the social work of two people. Let your partner handle their own family occasionally rather than smoothing it for them, since the smoothing prevents anything from being sorted out.
An unspoken problem keeps you up
Where something is wrong between you and your closest person and has not been named, your mind runs all night constructing versions of it. The relief comes from saying it rather than from resolving it, which is worth knowing since you will delay speaking until you have the whole thing worked out. Say the unfinished version.