Yes, I've been there as well (several times!): addicted to daydreaming about being with someone else, and it's so time-consuming, don't you find!?! If you think being with them will make your life happier, then the issue could be your unhappiness with your current life situation, or with sadness you might currently be carrying, and perhaps that's the area which you need to concentrate in sorting out? Just talking from my own experience, I'm no expert though. Wish you all the best of luck with this.