Charles is the love of Erik's life.
Erik is also the love of Charles' life.
But... Charles died, killed by Logan's clone.
Erik was very sad, he thought about Charles all the time, and he even disbanded the brotherhood.
Charles, only after I lost you did I realize that you were the only one for me.
Starting over again, there is no hatred between us, only love.
Charles, if you do it again, I will definitely catch you.