Well, if things don't work out with his girlfriend, wait a while and then say that you're interested. Just don't be surprised if he ends up getting a little angry that you changed your mind after rejecting him twice. Though I wouldn't make a move while he's currently dating someone. Maybe try and be friends with him first if you aren't already, talk about anime and stuff, and see if you start feeling anything else.
wow this sounds like a manga
...good luck
Aw come one... Just forget about him and cheer for him honestly... Wether it will work or not between them, that s not your business anymore. You choosed to rejected him, so be a good girl, and let him go already. Thats just your ego speaking rn..! I dun hate you, but i think you should grown up a little. No hard feeling
To me sounds if you where scared to like him so you went the friend root but if you know that the girl is bad for him say that to him he won't believe you but when he breakup with her be there but never ever say told you so to him. Still be the friend later be the girlfriend. I don't think you will hurt him when you are with him because you are mad for him about the bad girlfriend. So good luck
This is irrelevant but i just wanna get it out of my chest. Last year a guy in my class told me he has a crush on me and asked me out. He's tall, smart and love anime/manga just like me. It's very rare for Cambodian to enjoy these so I was surprised. He confessed twice but I rejected both time. Why? I don't wanna date him because I'm an unloyal piece of shit and i wanna befriend him so we could talk about our common interest. I knew our relationship won't last long so I rejected. Now he has a girlfriend (also an unloyal bitch, even worse than me) and somehow it annoys me. I'm still not certain what kind of feeling i have toward him. I'm so selfish fuck me.
edit: oops seems like everybody hate me now lol its okay i hate myself too. anyway just to clear thing up no I'm not gonna go out of my way to break them up. I'm horrible but not to that extend. i don't steal other people's man even if they're my enemy. I'm just sharing this because i want to?