[ad]Aries is always right — for there are no other viewpoints to consider — so the best way to come back is to yield. You probably broke up because you locked horns with the Ram, and realized that he would never concede. So you left, and realized either that you were wrong, or that even though you are right, you are willing to brush pride aside to be held beneath his powerful arms.
You don’t need to plan an elaborate apology. He burned through his anger weeks ago! Just admit the error of your ways, and pledge that you will follow his lead on all matters. If he has not already moved on to someone else, Aries will likely take you back.
Comment below: How have you returned to the Ram?