i am an excessively sentimental person, probably to a fault, so i try to do it whenever i am able. people don't easily just stop mattering to me and i always hope to make our relationships reflect that, but it definitely takes time to feel normal and isn't possible in every circumstance. taking the appropriate amount of time needed to understand what that person means to you/would treat you like outside of a romantic context, and if that is a healthy dynamic for you, is key. the best friendships with exes are casual, infrequent, and voluntary with no expectation of hanging out or talking every day or anything at all really. just their occasional presence