idk i think keep them until you're interested in someone else and then reconsider… i’d def be upset if my partner kept something like that from a past relationship especially if they were never opened and you just have them for comfort because it would seem like you’re not over that relationship but that’s just me. i also think if you’re not fully over them it would be helpful to get over them if you didn’t have those sitting in your room or wherever but everyone is different!
