Most Helpful Guy
The answer is yes. Forget about the dude and just move on.
Most Helpful Girl
He seems like quite the asshole to already have a new girlfriend just after 3 weeks and be flaunting it around. It's almost like he's trying to rub it in your face. And at 23 you like to believe that he is mature enough to handle certain things but the truth of the matter is not everyone is on the same level.
I think you should just forget about him all together because it's not worth trying to get back at him, it's only going to cause you more tension.
This is what I've learned: "In the end only three things matter... how much you loved, how gently you lived, and how gracefully you let go of things not meant for you".