Look up key things in your dreams! It might not be a dream about your ex at all actually! It could be about something going on in your life right now that your subconscience is linking to the memories about your ex bc whatever is going on now is making you feel like you did when you were with your ex! (I don't mean your current bf, I mean ANYTHING in your life)
Dreams are sooooo interesting! I'd love to learn more about what they mean! I have VERY vivid dreams fairly often!
So look up key things like colors you remember and other objects or people in your dream, you might be able to formulate what your dream was meant to mean! Let us know!!