I,m in love and i do not know what to do she say she love me but how could I no if its tru?

I'm sure she means it. I don't think its such an easy task to tell someone you love them... at least for me it isn't. Only time will tell, I'd say. But I like to believe that if someone tells you "I love you" they mean it. If they didn't, it'd seem a bit cruel wouldn't it?