I F/23 obsession over ex /23 but I’m MARRIED AND HAVE A FAMILY

I F/23 still think about my ex. I don’t mean to, but I keep dreaming of him, almost every night without doubt I’ll close my eyes and there he is in my dreams and we are back together and it feels so real. In my dreams I always see my husband and son and they always make me choose who I really love and I always say “my ex (J)” and that’s when I wake up. I feel so guilty for having these dreams. I feel like I’m cheating on my husband, but the worst is, that I love this dreams because it’s the only time I can see my ex and be with him again. I know this is bad of me and my husband doesn’t deserve this towards him. But I don’t know what to do, I’m married and I have a son and I can’t break up my family. Any advice how I can move on? I just feel shitty walking up my husband when I’ve been dreaming of my ex and wishing it was true. Before you ask me if I love my husband….. idk. I think I love him but maybe more in a friendship way. I have never felt the way I feel about my ex with no one else.