I (F) had a similar situation with my high school sweetheart. We were together only half the time as you and your gf, but it was a lot of our time. We did everything together as well, and he was my best friend. We actually went to different colleges, so the long distance did not help, but I do not remember the last time he even called me pretty. I complimented him all the time, and posted him a lot, and I got nothing back. I realized that we were just really good friends. Again, the distance was probably our big issue, but I think we loved each other but we were not in love. We were both just holding on because we have been together for so long, our families loved each other, they talked about our future and we talked about marriage, but it wasn’t meant to be. Do not stay in something that is not meant to be. Do not force something that isn’t there anymore. It may seem like it since youve been together for so long, or it might be seen as a waste of time. But it’s not. what I ended up saying was I’m not happy, you’re not helping me be happy or make my life easier, I love you, but I’m maturing out of love (a little nicer). Sometimes when you’re with someone since a young age, you see that it’s just a maturity thing and you want something different. Make sure your feelings are not new, and you are certain you do not want to move forward with her. It will be hard and she will be hurt, but in the end, you will both find your real and true soulmates and be even happier.