<human>: I have been dating my girlfriend for a little over a year and we have gotten very close. We do the 'I love you's and even sometimes bring up the idea of living with each other someday. I got to college in a town that is about an hour away so we see each other occasionally. We really have not had any problems in our relationship and she is very in love with me. Today She even posted on twitter that the 'love of her life' was coming home for summer break next week. 

The problem is, I don't know if I feel the same way. I like making her happy and I usually have fun when I'm with her. However, she is both my first real girlfriend (had a monther before) and she is the first girl I have had sex with. This concerns me because I recently have been having feelings that I want to be with other girls. There isn't a specific girl I'm thinking of but I kinda just want to see what is out there.

I keep going back and forth about whether I should break up with her or if I am happy and I should stay with her. I don't want to lead her on too long if I am going to break up with her someday. I don't see her breaking up with me either. I'm in a really tough spot and I could use your guys advice, thank you.

Can you summarize the given text in a few sentences?
<bot>: In a pretty serious relationship. Having feelings that I want to be with other girls. Not sure if I should break up or keep going.