You want to get back an Aries man. Obviously things did not work out the way you hoped for with your boyfriend. Relationships have a way of careering off course when we least expect it. After the dust has settled, and the break up is behind you, you may come to an awakening. Realizing that he's the guy for you is difficult enough. Figuring out how to get him back in love with you is where the real challenge begins. If your guy is an Aries you're going to have to approach things from a specific angle. You need to regain his trust so he can open his heart up to you all over again.
There's a big misconception among women that they feel the brunt of the emotional turmoil after a break up. That's simply not the case. Men feel things just as passionately. They experience the same pain that we do and it naturally leaves them wary of trying the relationship again. In order to get an Aries man back you have to show him that he can trust you with his heart once again. To do that you must be strong and emotionally stable. You have to work towards getting him to see that you're the only woman for him.
The first thing you should be doing to get him to feel closer to you is initiate a platonic friendship with him. This is important for two reasons. First and foremost it ensures that you'll remain a positive influence in his life. You already know him very well and so becoming a friend to him will feel comfortable and natural to both of you. Aries men are very open to the idea of maintaining contact after a relationship ends, so he 'll likely welcome the idea with open arms.
The other reason you want to become a friend to your ex is you need to work on showing him the improvements you'll be making to yourself. You're going to work on being more confident and self sufficient. Aries men go wild for women like this. You're also going to be mature enough to recognize that the past needs to stay in the past. Drudging up the break up time and time again will only alienate him more. He wants to move forward and away from that pain, just as much as you do.
As your new friendship develops show him that you're definitely someone he can lean on. Be there for him but keep the romantic feelings at bay. Your focus needs to be on demonstrating to him that you're a strong and reliable presence in his life. Once he senses this, his heart will be much more open to the idea of the two of you moving from friends to romantic partners again.