When girls say, "I was interested … In the beginning. But now I'm not because we're friends and I want to keep it that way"—it means she isn't interested. If, after getting to know you, someone wants to "keep you friends", then it's a good thing you didn't get together. The "friend zone" is specifically friends & there is nothing you can do to change this nor should you try because women are people not objects, nor did you do something wrong; the only girl who would ever be like, "Oh! He won't make a move on me?? Fine! We're just friends—for life!!!!" is a hussie.