If she really loves you, and you both truly discuss it like adults, she should understand. There's nothing wrong with her missing you and vice-versa, but every human being needs to be alone sometimes. And when I say sometimes, I mean there are times during the day that I like being down in my basement working on my bikes or out working on my car. Every second of her and your day does not need to consist of you and her on the phone. Luckily, my girlfriend is asian and likes cars just as much as me and likes to talk about them .