“We should hang out” means nothing until someone picks a day.

Warm intentions do not hold a shape on their own. The sentence feels like a plan, so both people walk away satisfied, and then it never happens and nobody can quite say why. A friendship kept alive by good feeling and no calendar slowly turns into the memory of a friendship.

Be the one who names a day. Not someday, not next month, an actual Thursday with a time on it, and let the other person move it if they need to. Most people are waiting for somebody else to go first, and going first costs one message.