He is mute.

you're in a relationship with him when a cancer appeared 

happened to be in his throat so he couldn't speak.

at that time, you're starting to disgust him.

You're always thinking if you will dump him but you couldn't because you know, people will hate you if you did that so you just keep him by your side so your popularity will be stable as always.

But deep middle of your heart, he's alaways there but you kept on denying it.

And at the end, a new motto is imprinted in your heart and mind.

"Do you need something bad to happen to realize someone is important to you?"

and at that moment, you just kept staring at something that you used to hate. Tears flowing after realizing it is important to you. No one's money can buy it.

But you can't bring back the time. A sorry can never bring it back.