Did you tell this person that you were pining for them all day every day? It doesn’t really sound like you can let them go. Close your eyes. Imagine going about your day and not having any contact with them, but when you think about them, how do you feel? How do you feel that they’re never going to be there, as you’re going about your days? You need to cherish the things that you want to hold onto, not push them away. They will fade away and be gone. If you feel like them fading away is not going to sit right with you then tell them.