It's Chanyeol's fault.

If he hadn't courted Baekhyun, he would never be experiencing heart break.

If he hadn't shown his true personality and genuine love, he would never fall for him in the first place.

If he hadn't given him everything, he would easily move on.

If he hadn't loved him, he wouldn't be experiencing heart break right now.

It was never Chanyeol fault. It was his.