I do. All the time. There's a particular famous person I've liked for years now and I'm constantly fantasising about what our life together would look like. Different scenarios in which we bump into each other. Playing it out in my head like a story over and over. When it runs its course, I think up a new scenario. Totally sad, right?!
DH doesn't quite know the extent but I have told him jokingly I'd leave him in a heart beat for this person. He thinks I'm joking but I'm not so sure! 😅