<human>: My girlfriend and I started dating in high school at age 16m/15f. We had two great years together but eventually she became distant because she felt that she was too young to be in a serious relationship and wanted to have a single life and meet new guys. After a year apart, we met randomly at an acquaintances new years party where she confronted me saying she missed me and after about a month after we started dating again. The problem now is that again after two years she isn't feeling the "puppy dog" love you feel in a new relationship. This brought up the "I'm too young for a serious commitment" problem she has. I don't disagree with her, but I don't understand why it's a problem if we are still having fun and love each other. So reddit, how do I show my girlfriend that we're still worth it and get back that feeling?

Condense the text into a few key points
<bot>: girlfriend says she's too young to be in a serious relationship and wants out because she wants to feel the "puppy dog love" a new relationship has