Fixing someone's broken heart is much more like treating a sickness, no matter how hard you try, if you're not the right medicine for it, you can never cure the pain.
You don't have to waste your time thinking on him. God has a purpose why it happens this way. And He was the one knows our future.
Cheer up my darling, this is not the end of the world. Mark my word life is beautiful after the separation. Move on my dear!