True love?

How does a guy really know that a girl loves him? my girlfriend hugs me and kisses me etc but im not sure if she actually loves me, help! apparently i need to add more detail, ive been dating her for about...3 months, i have met her family, we have been to each others houses, we call/text each other eextremely night, sounds perfect huh? however..she sometimes gives me that "ew!" look towards me...sometimes she goes in a little mood when im with her but nobody is perfect...we are in our teenage years, she has had a few relationships before
Answer
It depends on her personality-i am un-emotional and not romantic but when i do actually love some1 (and only when i am 100% certain) i say it