What you have actually noticed
Suspicion blurs everything together: things you saw, things you heard, things you imagined at 2am. Today you start separating them, calmly, on paper.
Write down what happened, not what it means
When you are suspicious, every detail gets filed as evidence. A late reply, a new password, a smile at their phone. After a few weeks it feels like a mountain, but when you look closely much of the mountain is the same two or three things, remembered many times.
An evidence log is simple. Only what you directly saw or heard. Dates, plain facts, no interpretation. It is not a case against anyone. It is a way of getting your own head clear.
Some of what you write may genuinely be worrying. Some may shrink on paper. Either way, you will know more than you do now.
Separating observations from interpretations is a basic step in cognitive behavioural therapy. It matters here because people are poor at judging deception from behaviour in the moment: a large 2006 review by Charles Bond and Bella DePaulo found people detect lies at about 54% accuracy, barely better than chance.
List what you have actually seen or heard that worries you. Only facts, with rough dates. No interpretation yet.
Looking at your list, when did things seem to change? Was there a point where it began?
Quick check
Which of these belongs in an evidence log?
Take this with you
Write what happened, not what it means. The meaning comes later, on a calmer day.