How can someone break up with someone they are still in love with?

I have been broken up with me before. Last time, I knew that he just didn’t loved me anymore, or not enough.

But this time, I’m not being delusional. I know that he still loves me and still is in love with me. I just know… However, I still don’t understand how someone can break up with someone they still love.

I don’t know what’s worse. Being broke up someone who doesn’t love you more or someone who still loves you …