you talking about a cat or a dude? if it's a cat, i understand. if it's a dude, you should get a cat!

You are experiencing what is known as "Cold Turkey" in love, as you got addicted / hooked similar to drug addicts.

What you should do now is find another drug as replacement OR go for rehabilitation.

Another option is to find him and slowly withdraw from him ..

Humans are emotional beings, and are in habit of living in couples from 30 million years.

Take care..

Just a suggestion. Go out. Have a bottle of wine. Get laid. Life goes on

Did you get played by someone in person or online?

Why did he leave?

Where did he go?

Where is he now?

someone die??

Get a new one

Less information to answer this