Enough here to stop guessing

What this means

What you described is not one worrying thing. It is a cluster: changes that started around the same time, a phone or a schedule that closed up, details that came out differently the second time you heard them, and a reaction to plain questions that leaves you apologizing for having asked. Somewhere in the last few months you also crossed a line you did not plan to cross. You started checking. And what you found did not settle anything, which is how this usually goes.

This result does not tell you that your partner is cheating. It cannot, and neither can any quiz. Nobody here has seen your partner. This is a mirror, not a verdict. What it says is that you have arrived at the point where watching more closely stops producing information and starts producing damage, and where the honest next step is a direct conversation you have probably been avoiding for weeks.

Why more watching will not help

Surveillance feels like it is closing in on an answer. In practice it does the opposite. If you find nothing, the relief lasts until the evening and then the mind concludes you simply have not looked in the right place. If you find something ambiguous, and almost everything is ambiguous, you now have a fragment you cannot ask about without revealing how you got it. Either way you end up more certain and less informed, and it costs you your own sense of yourself, which you will want back regardless of how this turns out.

There is also a cost you may not have counted. Months of this changes how you see yourself. People in your position often stop trusting their own memory, get quietly ashamed of who they have become, and let friendships thin out because the subject is exhausting to keep raising.

What to do next

Have one direct conversation, prepared in advance. Not a confrontation with evidence laid out, and not a hint. Say something close to: "I need to ask you something directly, and I need a real answer rather than a comfortable one. Are you involved with someone else? I am asking because a lot has changed and I cannot keep guessing."

Then stop talking and watch what happens. You are not judging the answer alone. You are watching whether they can stay in the question with you, whether the account holds together, and whether the conversation ends up being about you again.

Decide beforehand what you want out of it, and keep it about you rather than about punishing them. "I want to know what is true" is a workable goal. So is "I want the secrecy to end, whatever is behind it."

Tell one person in your actual life. Carrying this alone is what makes it distorting. One friend who knows the whole picture is worth more than another month of private analysis.

If the harder pattern here is not secrecy but what happens every single time you raise anything, the shape of that reaction is worth looking at on its own terms.

What this is not

This is not permission to leave and it is not an obligation to stay. A quiz cannot hold either of those decisions. It can only reflect what you already described back to you clearly enough that you stop arguing with yourself about whether you are imagining it.