Q: How will I know if we're meant to be?
A: At the first place, God will be the One who will tell you that you're meant to be and He will also be the One to find ways to prove that you should be together
Q: how can i move on?
A: It's hard to move on specially if you really love hte person, but you also need to know and understand the "limitations" that will keep you apart and different. So, for you to move on, you should try to forget him, if you tried ans still you can't, you need God's help, PRAY..pray that God will help you forget him and tell anything you want, remember: God is your friend, He will help you everytime you need Him.
try to be busy, do things that will make you busy, it will help you to forget him. Exercise, it will help you loosen up and control your depression. Listen, understand, and sing sad type of songs, you'll learn something from it..write what you feel, it will help you control your feelings. And, tell a friend(trusted one), he/she will always help.