Hell is forever, the sins of anyone is not that great that they will force Allah to undo what he has created. The sinful person goes to Hell forever and they are then the fuel for the fire. The fires worship Allah. There are 9 angels running Hell. Satan does not run hell and will be thrown in there.
Nobody's love opens the gates of Paradise. The angels are not singing about you in Heaven. People have elevated themselves to such importance thinking that just because someone cared about them, they are now being watched by them in Heaven-where have they received this revelation? There has been no religious texts to say if you love someone so much, they will care about you when they are dead.
People should have elevated the one God. not themselves. You are not important and those who don't repent will go to Hell, the people in Paradise will not be miserable because of their own actions.