Maybe you'll need to prove to them your love is true. In my opinion, I think if the person is worth it, there's nothing wrong to want them or to fight for them. I don't think it will waste my time. It depends on who that person is actually...
I agree that we should stop loving someone that doesn't love you back. It is a really waste of time. I believe that there are many more guys in this world that deserve you. So don't stop on to one person. Move on, life is short. Live every second to the best.
Yeah, we are probably wasting our time. But, I agree with mint that if the person is worth it, then it is more than fine. If he is just a guy who takes us for granted or is just not that into us or just doesn't see how good we are, then I guess we should just move on. This is a big world. Someday we will find someone who appreciates us and would like to take care of us. :D