Here are some difference that I have found between someone who LOVES you, versus someone who "claims" to love you.
1. He will do the little things
When you really love someone you think about that person, and what you can do to make their life a better place. Whether it is a cute love note, or even a favorite dessert of theirs, you want to brighten their day. Little things like text messages, or compliments go a long way.
2. You're his priority
Sure he is busy with work, and family and 30 other things, but he makes time for you. He would rather spend time with you than go out partying with his friends. You're not an option, you're the priority.
3. You over him
He will put you over him. If you want pizza for dinner and he wants tacos, he will go for pizza because he cares about what you want. If going shopping for three hours makes you happy, he will do it.
4. Ego and pride are on the back burner
Simple. In an argument he will give you a hug, or apologize just to calm you down and reassure you that he loves you, although you may be the one in the wrong. He will do so because his love for you is greater than his need to be right and stick to his guns. Doesn't make him weak, makes him a loving man.
5. His actions > His words
He doesn't spend time telling you how much he loves you, he shows you. He will treat you with respect, show you off to his family and friends, and you will feel a genuine quality about him.