wendy1

Beat him over the head with a stick and he'll tell you. If he doesn't you'll know he's hiding something.

KeithD's got it.

Is it in his eyes? Oh no, you'll be deceived.
Is it in his sighs? Oh no, he'll make believe.
Is it in his face? Oh no, it's just his charms.
In his warm embrace? Oh no, that's just his arms.

If you wanna know if he loves you so, it's in his kiss.

(Actually, don't bother trying. You'll know, eventually, I hear)