Qui-Gon noticed how much less worried Kenobi looked when he came back from the bathroom. He made a mental note of that, keeping it in the back of his mind, along with all of the other things that Kenobi had been doing strangely.
Looking pale and nervous.
Looking over at Obi-Wan and Anakin as if he were expecting something.
Getting nervous when they were out of sight for any amount of time.
Seeming uneasy about the fact that Obi-Wan and Anakin had started getting along so well.
Looking less nervous when he had his eye-
Oh.
Oh dear.
Perhaps, Qui-Gon thought, I ought to have a talk with Obi-Wan about attachments.