A familiar relationship still benefits from an occasional clear invitation.

Long relationships run on assumption. You both know the other is welcome, so nobody says it, and gradually the practical work of arranging anything falls away while the affection stays exactly where it was. What is missing then is not warmth but a specific invitation with a date on it, which is what turns goodwill back into an actual evening.

Think of someone you would obviously see if it were easy, and send a real proposal this week: a day, a time, a place. Do not wait for a reason or a special occasion. Familiarity survives on its own; contact does not.