Sometimes he doesn't even have to really do anything to reveal that he's deeply in love with you. Sometimes you can just tell with the tiniest actions. Cher once sang that "if you want to know if he loves you so, it's in his kiss." And while we tend to agree that kissing is a big indicator, we think the way he looks at you can say so much more.
If you ever look across the room and see your man looking at you as though he has just won the lottery, it's likely he's well and truly head over heels in love. He knows how valuable you are and feels extremely lucky to have found you. So lucky, in fact, that he can't even believe it. This is the kind of man you definitely want to keep around.