You know those days where everything is falling into place and good things keep happening? The kind of days where you can't wipe the smile from your face? If your girl is in love with you it will be like she's having one of those days every time she's around you. She can't get enough of you and the fact that you're a couple always leaves her feeling like the luckiest person in the world.
When you look across the room at her, she can't help but give you one of her biggest smiles. She'll even smile to herself when she thinks you're not looking. Basically, every time you're even on her mind it will bring a smile to her face. That's what happens when you're in love, so it's a sure thing if your lady is behaving like this!