Indeed the brains of boys and girls work differently.
And a lot depends on what else is on your mind.
Think of it this way ~ you can love your parents, kids, partner, siblings, friends, pets ~ and you can love them wholeheartedly and all the time, but does that mean that you are thinking about them all the time?
If you stopped thinking about them for a while, does it mean that you have stopped loving them?
I agree that in the early stages of young love, girls and boys tend to think about their partners a lot, so you do want to be reassured that he loves you, but as long as he does, try not to pressure him into being someone he isn't.