Letting Go

So I think I lost a friend. I still don't want to admit it, because I don't want him to be gone, but I know it's over.
Yeah, it sucks, but I guess I understand. Or as much as I can understand. I mean, I'm partly to blame, but I really think he's just as much to blame as me.
Sometimes things just don't work out.
I've been trying for so long to keep things going, and really, it's one sided and I just want to say good bye. It's almost like a break up at the end relationship that's been drug out so long you just can't deal with it anymore.
I'm bummed, because it was one of those people that I thought would be in my life forever you know? I mean, he had such a huge impact on my life, whether he wanted to or not, and I think that I made an impact on his, just maybe not in a good way in the end. Some things just aren't meant to be, and certain things happen where it may be impossible to keep a friendship going afterwards. It just sucks, when you feel that strong bond with someone, you know, a really good friend, and it ends like this.
I just don't know what to say to him to let him know I'm done trying.