I am searching for a manga like Houkago Orange where the guy loves the girl, but because of some matters he becomes the bad guy.
At first he doesn't admit that he loves her and hurt her quite deep, but after realizing that, it was a bit to late. She tries to not love him anymore...

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He stepped back and threw his arms out.
"I'm always crazy around you Rose. Here, I'm going to write an impromptu poem for you."
He tipped his head back and shouted to the sky:
"Rose is in red
But never in blue
Sharp as a thorn
Fights like one too.” - Adrian; Shadow Kiss


http://www.mangareader.net/782-43930-9/heart-no-kuni-no-alice/ chapter-16.html