Why is it that if I make an action, the action will still play even after I exit the action editor? How can I stop this?
The data block is still linked to the object unless you unlink it. Save the action data block if you want to keep it by pressing the F in 2.79 or the shield in 2.8. Then unlink it by pressing X . You now have a new action data block that is empty so nothing will play. Press new when you are ready to animate another.