We can't stop anyone to love somebody, neither we could stop someone to go away! What we can do is to just love truly.
Love can exist in many forms, it is on us, which one we explore and live with it our whole lives.
The Most beautiful thing is to see a person you love smiling. And even more beautiful is knowing that you are the reason behind it.
Just let it go, Please don't come back. Who? Devils of Mind!