A partner is somebody you make a family with
Your taste is Cancer-soft and it is spent on partnership, so what you are looking for is not company but belonging. A relationship, for you, is the beginning of a household: somebody to build a shared life around, with all the permanence that implies from the first month.
This makes you an unusually devoted partner and it sets the stakes very high very early. Casual arrangements do not really exist in your vocabulary, and you have probably found yourself attached before the other person had decided anything at all.
You look after them, whether or not they asked
Once somebody is yours, their comfort becomes your standing responsibility: their appointments, their difficult family, their bad weeks. It is generous and it can quietly convert a partnership into a parenting arrangement. Ask what they actually want handled. A good deal of what you carry was assumed rather than requested, and some of it they would rather do themselves.
Their weather becomes your weather
You absorb a partner's mood at close range and cannot easily tell whose feeling you are having. A difficult evening for them is a difficult evening for you, even when you were perfectly fine an hour earlier. Learn the distinction deliberately: name whose it is out loud. That single habit gives you back a great deal of the equanimity you lose to other people.
Loyalty that outlasts the evidence
You stay, through difficulty and through things that would have ended it for somebody else, because leaving means dismantling a family rather than concluding a relationship. That constancy is genuinely rare. It also needs a floor underneath it, so decide in advance what you would not accept, and write it down while nothing is happening.
The retreat that looks like a wall
When hurt, you do not confront; you withdraw and go quiet, and from outside that reads as coldness rather than as injury. Partners often have no idea what happened. Say the fact of it even if you cannot say the content: a sentence about needing an hour is enough to keep somebody from concluding entirely the wrong thing.
Ask for reassurance rather than testing for it
You need more reassurance than you say, and when it does not arrive you tend to check indirectly: withdrawing slightly to see whether they follow, mentioning something to see the reaction. It works badly. Ask the plain question instead. Almost every partner would happily supply the answer, and none of them can decode the test you set them.
Belonging to somebody, without disappearing
What you want is a life shared completely, and the risk attached is that you gradually stop having any preferences of your own. The practice is small and continuous: keep one friendship, one interest and one afternoon that are entirely yours. Not as a precaution against the relationship, but because it is the person with a separate life who is worth coming home to.
Their relatives become yours immediately
You adopt a partner's family with real commitment: the birthdays, the difficult uncle, the visits nobody else wants to make. That is a substantial gift to somebody. It can also mean you inherit obligations your partner has been avoiding for years. Check which of these are theirs to carry before you take them on permanently.
An unresolved argument keeps you awake
Conflict at home reaches you physically and stays until something has been repaired, which is why you will agree to things at midnight that you do not mean. Do not settle anything late. Say that it will be dealt with tomorrow, then actually deal with it, since your worst agreements have all been made in the service of getting some sleep.
Coupled friendships, and what happens to them
Much of your social life runs through your relationship: shared friends, couples you see together, a circle built around the two of you. It is warm and it is fragile in exactly one way. Keep two friendships that predate the partnership and belong to you alone, and see those people without your partner at least a few times a year.