“We should hang out soon” is how most friendships quietly end. Put a date on it.

Vague plans feel like caring while committing to nothing, and they can keep a friendship technically alive for years without either person ever seeing the other. Both of you walk away warm, and nothing lands on either calendar. Eventually the gap gets long enough that reaching out feels awkward, and that is usually where it quietly stops.

Take the next one of those and make it specific inside the same message. Name a day and a thing: Thursday, that place, after six. If the day gets moved, move it rather than letting it dissolve.