You merge with whoever you are closest to
Because your Pisces Sun works out of the 7th house, your sense of yourself forms inside a close relationship and it does not stop at the edges. Their moods, their plans and their preferences become yours faster than either of you notices. You need a partner who will hand your outline back to you.
That capacity for union is the most profound thing you offer and it makes the wrong relationship unusually costly, since by the time you can see it clearly there is very little of you standing outside it to look.
The one you fell for was partly your own work
You perceive what somebody could be, vividly and often accurately, and then relate to that version rather than to the person in front of you. It is a generous error and it postpones the real relationship by years. Ask them what they actually want, in their words, and take the answer as more authoritative than your perception.
The pull to rescue
Somebody in difficulty activates something in you that resembles love and is closer to vocation, and a run of relationships built on that pattern is common here. It is generous and it is not equal. Notice whether you would still be interested if they were fine, and if the answer is unclear, that is the information.
Disappearing by degrees
A year into any close relationship, a certain number of your own preferences, friendships and habits have quietly gone, and none of them were taken. Keep a written list of what is yours: the people, the practices, the things you do alone. Check it annually, because the loss is gradual and entirely invisible from inside.
Somebody who hands you back your edges
What you need is not distance but a partner who asks what you think and waits for an answer that is not theirs. Those people exist and they are not necessarily the most compelling ones in the room. Prioritise it over intensity, because intensity is easy for you to find and being kept separate is not.
The most complete union available
What you can offer is a closeness with very little held back, and for the right person it is unlike anything else they will experience. It requires one safeguard: a thing you do not merge, chosen in advance and kept regardless. The relationship is stronger with it, and you are still there when it changes.
You take on the client's problem
Working closely with somebody, you absorb their situation as though it were yours, which makes you unusually effective and leaves you carrying accounts home. Set a mechanical boundary: a fixed time after which no client thinking happens. It is the only kind of limit that survives your instinct to keep helping. Set the hour, tell a colleague what it is, and let the rule rather than your judgement decide when the day ends.
Two friends who knew you in two relationships
Anybody who has known you across more than one partnership has met two noticeably different people, because you take on the register of whoever you are with: the humour, the interests, the way you spend a Saturday. Friends notice and rarely mention it. Ask one of them what changed last time, and take the answer as information rather than as an accusation, since they have data you do not.
Absorbed into their family
You take on a partner's relatives thoroughly, including their conflicts and their assumptions, and you can end up more involved than your partner is. Notice whose family business you are managing. Handing one situation back, plainly and without offence, is usually a relief to everybody concerned. Say it once, warmly, and then decline to be the channel for that particular matter again.
A shape that survives the relationship
The question underneath this placement is who you are when nobody is opposite you, and it can go unanswered for decades because you are rarely alone. Spend one deliberate stretch single and treat it as a period of work rather than a gap. What you find there is what you bring to the next one.