Another trigger to intense attraction in men is teasing them. Men like to be teased because it feels like you’re poking them in order to make them fight even harder in order to win you.
Tease him about the T-shirt he’s wearing or about the last message he sent you.
Subtly make fun of the things he does, and he will find it amusing and at the same time challenging.
He will see that you don’t accept everything he gives you which will make him realize that you know your worth. And this realization is what makes him attracted to you.