I don't typically do this but I could use some advice.

RustyRatRod said
Tell him you cannot and be honest as to why. What he decides to do with his life is totally his decision. You will probably lose his friendship either way. If you continue to try and tell him, he will choose her. If you don't participate in his wedding and tell him why (as you should) he will choose her.

He will choose her regardless, so let him.
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We went fishing a few days after it happened and I laid it all out for him and told him how I felt about the situation and me kept saying he was done with her. He's been with her every day since then so it didn't stick but next time I see him I'll give it one more shot and then let it go.