can my ex just get out? 🙄

Girls, me and my ex have been separated for about a month or two. And I'm already talking to someone else that has many qualities that my ex didn't have, meaning in very happy and looking for ward to having a relationship with this guy. But why does my ex keep coming out in basically every dream I have? I hate it! Bc I'm trying to move on with my life and usually every morning or after a nap there's a dream about him! I don't want to get back together with him! So why does this keep happening? I literally feel like he did some voodoo - witch magic or something for this to be happening. Lol jk, but really... do y'all know why this might be happening? Or maybe how it can stop?