1.He Talks About Other Girls
If he's looking at or talking about other girls, he doesn't have eyes for you and that's an obvious sign of disinterest.He's actually finding other ladies more attractive than you were.
2.Doesn't Ask For Details
He doesn't ask you about your day, and even if he does, he sounds disinterested and doesn't ask for more.He's just going through the motions buh wants the conversation...