How Do I?

How do I tell the person I love that I still have feelings for my ex? I don’t want to break his heart, but I can’t fight them. My ex hurt me badly and he’s not in my life, but I still think about him every night. I’ve done seen him with new people and it hurts me that he don’t think about me. We never talk about my past relationship, because I and my new boo know that I and the other guy will never be together again. I want to tell the person I love, but he might take it the wrong way. How do I tell the person I love that I still have feelings for my ex?