If it feels like nobody knows you as intimately as your partner does, it's because it's probably true. When you're in love you tend to soak up every little detail about the person who has you under their spell. He thinks the way you sniffle when you're tired is adorable, he loves that you get emotional during dog movies, and he thinks it's funny that you can never seem to crack an egg properly.
He might not necessarily love the way you slurp your soup, but he definitely notices it! This is a great way to tell if your man is in love with you, as someone who isn't in love wouldn't even care enough to notice. He's crazy in love if he uses these little details to further please you. For example, if he knows you love eating cinnamon donuts, he'll often surprise you with one.