Often
The thought goes to a third person and stays there: the picture gets built, taken apart and rebuilt, sometimes out of a single word. Two things are worth naming, and the first is what this level is not. It does not mean you are inventing things — people at this level are regularly right, and suspicion grown from a real cause lands in exactly the same place as suspicion grown from nothing. The questionnaire does not tell them apart. The second is the mechanism: a thought with nothing to test it against grows unopposed, because it finds its own confirmations and accepts no refutations. Which is where the one workable move comes from. Not stopping the thinking, but getting what you have assembled out loud, into a conversation, where it meets something other than itself for the first time.
Sometimes
The thought arrives when there is something for it and leaves when there isn't. An unfamiliar name in a message thread, an evening that doesn't quite add up, someone else's laughter down the line — one of those will catch, you will notice it, turn it over and let it go. This is where most people are, and it isn't a compromise between trust and suspicion; it is attention doing its job. Complete blindness to signals like these is rare and rarely useful. What is worth tracking is not the level but what specifically catches you. It is usually two or three recurring triggers, and they tend to belong to a history — yours, or this relationship's — rather than to the person currently in front of you.
Rarely
Your mind simply doesn't go there. Your partner is late and you think about traffic; an unfamiliar name comes up in conversation and it comes up and passes. No storyline gets built, because there is nothing for one to start from. Reading this as trust feels good and is half right: most people at this level genuinely have no cause, and the mind is behaving exactly the way the mind of someone who isn't being lied to behaves. The other half is worth naming plainly — a low level also appears where not much has been invested, and then the calm means a low stake rather than a reliable person beside you. Telling those two apart from the inside is hard, and there is really only one question that works: if you were told there was cause, would it turn your week over, or not?