text: An allergy is your body's way of protecting you from something that it thinks will do you harm. So clearly your body thinks that your ex is something you should stay away from even if your head and your heart haven't caught up to the rest of you yet.\n\nThat's the snippy response, it's more likely that you're allergic to perfume your ex is wearing or the detergent they are using. But personally, I like the thought that your body is actually rejecting your ex... that's great and smart.