<human>: I've been with my GF for 2 year since we were both 19. She is my first serious long time GF and I'm her second (kinda first though). We fell very deeply in love and had plans about living together after high school and go to the same college. Our relationship is great but not perfect and I care a lot about her. I could see us go the distance.
My problem: Last night a female friend of mine declared that she had strong feelings for me, and we've been talking a lot to each other lately. She's a type of girl I could see myself with, but I've just seen her as a friends of course. Learning this has really twisted my mind. Suddenly I've been having second thoughts about my current relationship and the fact that I don't see myself "settling down" with my first ever GF. I mean, I'm 19 after all. Here is my question: Is this a reason enough to break up? I feel like I'm wasting my GF's time if I'm planning to end it some time later, especially since she's planning on going the distance with me. Our relationship is good and steady and I can't even imagen what it would be like to end it. Am I a douchebag? Please help me here...

Can you give me the gist of the text in a nutshell?
<bot>: In a good and steady realtionship but I don't see myself settling down with my highschool sweetheart. Also not the same feelings anymore. Break up?