E.D. I have to send you a huge hug. That is a sad story, real hurtful for you now but I have to say, a lot of your relationship is cyber fantasy. It was 5 years, but how much ACTUAL time were you together in real life ?
You craved your new start and built up a fantasy scenario with basically a fantasy person. I'm sorry, it sounds hard and uncaring, it's the complete opposite, I feel sad for your pain right now.

She is addicted to online games, and the online world. That's not real, and you got caught up in it. I doubt she will remain with this new guy. She needs the online buzz and possibly will say anything to build an online relationship. That is not reality, but fantasy.
You met and felt this connection, again how much of that was real ? The whole situation is not healthy, it's cyber land.

I won't say to you that you'll one day move on, meet someone and be happy. That is very true, but right now I doubt that would help you. You have to see what happened as a fairytale, and we all know they are not real.

Maybe stay in contact and chat, email her , but only eventually when you can start to accept the relationship was built on cyber magic, and a lot of vivid wishful thinking.
Maybe stay online friends, if you feel you can or maybe cut all contact. I feel if you cut contact though, the wishful thoughts and regrets will be in your head for longer. Maybe in time, occasional emails to her, will show you how her online life is turning out, and you'll realise that it's not real, and sadly never was.

I am sorry you are hurting right now. Maybe I helped a bit, hopefully I did.

Please try to look after yourself, and remember you can still have dreams for the future, but they have to be based on real life, with real people.
Hugs x