Why does Leafpool look at Crowfeather the way she does when she's around him?

Well... if you recall reading the part when Crowfeather and Leafpool run away together, of course they were in love with each other. When Crowfeather helped walk Jaypaw back to his camp after he fell into the lake, Leafpool and Crowfeather looked at each other in a way that Jaypaw didn't understand. Crowfeather and Leafpool looked at each other in that way because they were remembering the time they ran away together, and the also recalled their love for each other.