Why Does an Ex Reappear the Moment You Move On?
People want what somebody else appears to value, and that is wired in far below the level anybody chooses. The message lands now because of: 1) the scarcity principle, since you became unavailable and the price moved 2) social proof, because another person's interest reads as evidence they missed something 3) the Zeigarnik effect, since an ending they did not control stays open in their head, and closure is the story they will tell you it is about. The timing is not a coincidence. It is the entire message.
The pattern
Unavailable raised your value
Somebody else validated you
The ending never closed for them
The timing is the tell
Myth vs Reality
Myth
They thought about it and realized what they lost
Reality
They noticed somebody else valued it. That is a different feeling.
Read the message again and ask whether it is about you or them.