Thanks for your input, it's actually really helped me put things into perspective.
There's something quite romantic about it all don't you think? I get the impression you can empathise.
I think when a suitable opportunity arises, I'll tell him how I feel just to get it off my chest.

that's a tough situation, i think you're best to try to let it go and move forward. sometimes going backwards only makes things worse.

continue being friendly and if it's meant to happen it will on its own.

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It's been THREE YEARS and he's in a serious relationship with someone else now. I think you are wasting your time and energy with this. You need to move on, and if seeing him and talking to him is preventing you from moving on, then maybe you need to stop seeing/talking to him for a while. If he wanted to be with you then he wouldn't be in a relationship with someone else.

You're totally right. I'm making strong headway in trying to move on.

It's also totally obvious that you need to devote more time to yourself and your personal interests. You are an individual, remember, and there are so many things in the world for you to discover. I think that as you gain more independence and self-worth (for I sense that you are lacking in it), this guy will accordingly become more insignificant/trivial as a part of your life. It makes sense, doesn't it? Fill your life with meaningful things and push this guy to the side. There are more important things deserving of your time