Please avoid posting in Tagalog. ^^
Anyway, I know how hard it is. My ex and I weren't classmates, but we were batchmates and our classrooms are just beside each other. We broke up during the summer, but it was only about a week before school started. As much as I hated it, seeing him (though not as often as you since you're classmates with her) happy and moving on was very hard. It was heartbreaking. I wanted him back.
People cope differently, but I think the only way you could do right now is to be with your friends as much as possible. Friends make it seem less lonely. :] It's hard and it takes time. It took me 9 months to be completely over him. You may be able to 'move on' faster or slower, but you will. Just give it time. Ok?

Preoccupy yourself with things you like doing. If you don't feel like it, then at least try. Also, she told you to back off for a while, so you should do that. Maybe she'll realize that she wants you back in the future. Don't hope, but just follow what her request. You may not be able to get her back if you keep on pushing yourself into her world.