The people who change your life come from elsewhere
Growth reaches you Sagittarius-flavoured and it lands in the 7th house, which means the partners and collaborators who matter arrive from outside your ordinary circle: another country, another field, an entirely different set of assumptions. Familiar company does not enlarge you. What this needs is a relationship with room built into it.
That pattern is consistent across your history. Almost nobody significant came from the obvious pool, and the ones who did were people whose lives were pointing somewhere different from everybody else you knew at the time.
You need room inside the relationship
Closeness is welcome and being accounted for is not: a partnership that requires constant reporting closes you down within a year. That is a genuine requirement rather than an unwillingness to commit. Say it at the outset, since a person who assumes shared everything will experience your need for space as a slow withdrawal and neither of you will be wrong.
Promises made at the size of the feeling
In the early stages you commit to more than you have thought through, because at that moment the whole thing seems entirely possible. None of it is insincere and some of it is unaffordable. Say what you are certain of and leave the rest unspoken, because the shortfall between the two is what gets remembered afterwards.
You will say the difficult thing to them
Your partner gets the accurate version, including the parts that would be easier left out, and that honesty is one of the better things you offer anybody. It is also relentless. Ask whether they want the observation before you deliver it, since a relationship in which everything is said is not automatically one in which everything should be.
Leaving is easier for you than staying
When something stops working your instinct is to go rather than to renegotiate, and you have exercised it at least once where staying would have been the better decision. The exit is not the difficult part for you. Give any ending a full season before acting, since the going is available at any time and the alternative closes.
Your work travels through a partner
The collaborations that changed your professional life were with somebody who brought a completely different world with them: another market, another discipline, another way of seeing the same problem. That combination is where your value appears. Look for the partner who is unlike you rather than the one who is easy to work with.
Their household ran on other rules
Attaching to somebody has repeatedly brought you into a family that does things differently: another culture, another class, another set of assumptions about what is normal. You have learned more from that than from any travelling. Ask them how something is done there rather than explaining how it is done at home.
You have been enlarged by two or three people
A small number of individuals opened up your world in ways that no decision of your own would have produced: a language, a country, a subject, a way of living. Each arrived as a relationship rather than as a plan. Notice who is currently doing that, since the mechanism is still running and it works best when you cooperate with it.
Joint arrangements were agreed in good spirits
Money between you and a partner tends to have been settled generously in the early stages and never revisited since, and the arrangement no longer matches what either of you actually does. Nobody has raised it. Put one dull hour in the diary and reset the terms, since the goodwill it was based on remains and the figures have moved.
You need to still be curious about them
What keeps you in a relationship is not comfort but the sense that there is more of this person to find out. Once you believe you have the complete account, the interest goes flat regardless of everything else. Ask a genuinely new question this month, since the exhaustion of curiosity is usually your own inattention rather than their limit.