Well, you can't blame Lin Hao for moving out. He's been devoted to An An, and her alone, all his life but seeing her being intimate with another man and then refusing all his advances is too much of an emotional burden while living under the same roof.
I don't really want to read this as I detest love triangle stories (though it's almost impossible to avoid them in any romance series), but unfortunately my favorite genre is "childhood friends turned lovers" and I have hopes that An An and Lin Hao will eventually end up together. Sigh.