How can you tell if a guy is in love with you?

ask him if he is in love you. if he hesitates or looks uncomfortable then say "its okay if your not sure yet, I understand if you're not ready to say so yet" (before he says anything because he may just lie and say he loves you to make you happy, you can usually tell by body language if he is genuine though). the other alternative is that he will say he loves you with a big smile and no hesitation.

We are in the same age group. With my girlfriend I just couldn't talk/txt/e mail her enough. I was always touching her arm,shoulder & playing with her hair. I always wanted to be with her and went out of my way to show it. Meaning calling her baby, "MY" little (her name) things like that. I would play songs and use her name or motion to her during the lyrics. Corny huh well see my profile.
I hope someone can explain this better than I did. Good Luck!

OK, having deep feelings and being in love are different.
So for clarity, are you asking about being in love or having deep feelings?