The other person keeps arriving as a composite
The 7th house asks who the other person actually is; Pisces does not hold a firm line between them and you. Saturn in Pisces here means the boundary in a close relationship has to be built deliberately, because it does not exist by default.
So closeness comes easily and separateness does not. Within a year of anything serious you are operating on shared preferences, shared opinions and a shared account of events, none of it decided and all of it slightly inaccurate about at least one of you.
They think you have no requirements
Partners conclude, on entirely reasonable evidence, that you do not mind much about anything, because you have never once presented a preference that would inconvenience somebody else. The requirements do exist. They surface eventually as a general unhappiness with no identifiable cause attached to it, which is a great deal harder for either of you to address than a preference plainly stated in the first year.
The weight is losing the edge between you
The merging is not something you decide to do, and it produces a genuine difficulty: after a few years you cannot reliably tell which opinions are yours. That is not a metaphor. It is why the end of a long relationship has been so disorienting rather than merely painful — a portion of what was ending was you.
It comes due when the difference has to be visible
The test is a decision where the two of you genuinely want different things and it cannot be dissolved into a compromise. Your instinct is to discover that you never minded much. Stating the actual preference and holding it through a difficult evening is the exercise, and one such evening is worth several years of accommodation.
A partnership with two people in it
What this builds, once the outlines are deliberate, is better than either the merged version or the guarded one: two people who remain distinguishable and are genuinely close. That takes construction rather than instinct. The closeness was never the difficulty here — it arrives free, and everything else has to be built.
Your friendships take on the shape of the other person
With each close friend you are a slightly different person, adapted to them, and all the versions are genuine. It makes you an excellent friend and it means introducing two of them can be strange for everyone. There is no obligation to resolve this into one version, and it is worth knowing that it is happening.
In a partnership you drift into the supporting half
Working alongside somebody, you adjust toward whatever they are not doing, and within a year the roles have settled with you in the accommodating position regardless of what either of you brought. Naming the division explicitly at the start is the only thing that prevents it, since it happens by drift rather than by anybody's decision.
Some of what you want was borrowed
A proportion of your current preferences, ambitions and opinions arrived from people you were close to and were never examined afterwards. That is not a failing; it is how a permeable temperament works. Picking one significant preference and asking where it came from is a genuinely revealing hour and it needs no one else's participation.
Money merges before anybody discusses it
Shared costs, absorbed expenses and undefined contributions accumulate in your relationships without any conversation having taken place, and by the time anybody looks the arrangement is years old and impossible to reconstruct. Writing down what the current arrangement actually is, once, is not a challenge to it. It is the first time it will have existed anywhere.
You take on their family's difficulties as your own
A partner's relatives, their history and their unresolved situations become genuinely yours rather than something you are adjacent to, and you feel them at close to full intensity. That is unusual and it is generous. It also means you have been carrying material that nobody in that family has asked you to carry or knows that you are.