Somebody is either everything or an acquaintance
There is no middle setting and there never has been. Mars in Scorpio in the 7th house puts your entire capacity for attachment into one relationship at a time, so the person opposite you gets a depth of commitment most people never encounter and everybody else stays at the perimeter.
The sign is why the involvement is total and the house is why it concentrates on a single chair. That produces partnerships of unusual seriousness and one specific exposure, since everything you have is inside one arrangement and there is no second place for any of it to go.
The test they were never told about
You set small trials without announcing them: a piece of information withheld to see whether it is missed, a difficulty left unaided to see what they do. The results are treated as evidence and the subject never knew there was an examination. Ask the question directly instead. What you actually want to know is answerable in a sentence.
Conflict conducted at low temperature
You do not raise your voice. You go quiet, precise and unmistakably cold, and the room understands immediately that something has been decided rather than merely felt. That is more frightening to a partner than shouting would be, and considerably harder to respond to. Say what would repair it, out loud, while the decision is still open.
Absolute loyalty, with no stated conditions
Once somebody is yours you defend them without limit, against their family, their employer and anybody who criticises them in your hearing. That is rare and it has no terms attached, which means it can be relied upon by somebody who is not reciprocating. Decide privately what would end it. Not as a threat, simply so that an answer exists.
The end that arrives without notice
When you finish with a relationship the decision has usually been taken some time before it is announced, and the other person experiences an abrupt reversal from somebody who seemed entirely committed. From inside it was a long process. Tell them while you are still deciding rather than after. The gap between your process and their information is the actual cruelty.
Knowing them and managing them are different
Your attention to a partner is extraordinary and it can slide from understanding into a kind of quiet steering: what they are told, what is timed for when, which subjects come up. The line is whether they would be comfortable seeing your reasoning. Run that check once a month, honestly, and change whatever fails it.
Their friends have to pass as well
You form judgements about the people around a partner quickly and act on them, steering the calendar away from anybody who fails. Your reading is usually accurate and the effect on their social life is considerable. Say what you think rather than arranging the outcome, and then let them decide about their own friends.
The working partnership is a marriage
A business partner gets the same total commitment, which builds remarkable things and makes any separation a genuine rupture. Write the dissolution terms at the start, on the grounds that you specifically will not be able to negotiate them later. That paragraph is worth more to you than to any partner you will ever have.
Other people are how the material surfaces
The things you find hardest to look at appear reliably in close relationships and almost nowhere else, which is why your significant relationships have each been a period of change rather than a plateau. That is the mechanism working correctly. Stay in the room when it starts, rather than concluding that the relationship has become the problem.
Everything in one arrangement
Your instinct in a committed partnership is to combine completely, and total entanglement suits your temperament and removes every option. Keep one account in your own name, sized to a year, not as a hedge against the person but as the thing that lets you stay by choice rather than by circumstance.