Some friendships fade out and nobody did anything wrong. People come in seasons.

Closeness often depends on circumstance more than character. You shared a class, a shift, a street, and when that structure went, the friendship lost what was quietly holding it up. Reading that as rejection, or as proof that you are bad at keeping people, adds a hurt the situation did not contain.

It is still allowed to miss them. Reach out once if you want to, without treating the reply as a verdict on you. And count what the friendship gave you while it lasted, rather than measuring it by how it ended.