Using the word “love” for an enemy makes the word “enemy” obsolete. You can’t love an “enemy”! Maybe that’s Jesus’ point: the more we love our enemies, the less enemies the world will have. There will no longer be no “us” or “them.” There will only be “us.”
All the pain and suffering we’ve inflicted on one another will be recompensed in the next life, and as you forgive in this life, you will be forgiven in the next. You have one life now. Make sure you’re using it to fully become more like Christ, forgiving and loving generously.