Is it normal that i cry when i think about my girlfriend?

I've known her and have liked her since 2007. Back in the day, she didn't really see me that way though. But over the years we've been getting closer and closer (to the point where we began a very emotional "friends with benefits" thing) and although i let her know countless of times how i felt and that i wanted to be with her, she never wanted me the same up until recently, when i told her once again how i felt only to be rejected again. My heart gave up a little bit and i was very hurt. But to my surprise, she asked me to be with her 2 days after saying she had realized she wanted to be with me and that it felt right. We've been inseparable and happy ever since. One thing that is weirding me out about myself lately is that whenever i think of her throughout the day or if i look at her while we lay next to each other or if i hear a cute song that makes me think of her, my eyes get teary..like i swell with emotion so randomly. I don't know what this means. Last time this happened to me, years ago was when i was first in love. I don't think...i wouldn't say that i'm in love with my girlfriend now..i mean, it doesn't feel the same. What could this mean? Has this ever happened to anyone else? Please and thank you!