Oh yeah I understand you completely, I think i'm having the same issue. I don't have much of an answer myself, unfortunately.
At any case you are not doing him any favor by cutting yourself. So when you say "i'd even cut myself for him", you won't even have to
i guess the best thing to do is what everyone does when they have love blues: keep busy and meet new people.
On the other hand I understand you don't want to and that it's even more difficult to face someone you love "just as a friend".
As I say i'm having the same situation here and I feel like i'm lying to myself.
But still, neither of you or me can control their feelings, so we have to accept their choices. If they want us "only" as friend, so be it. Let's move on and seek for other people.
Just don't concentrate yourself on this, we don't want you to get hurt
i have no idea if this post helped you, but the topic practically summed up my own situation so I thought I could say a little sth...