If you really want to get back together with your ex, then you will need him to fall in love with you all over again. If you don't give him time to start missing you, then this is not going to happen. This may seem like odd advice, but to begin with you need to ignore him.
By contacting him on a regular basis, you are not giving him time to realise just how much he misses having you in his life. He will see that you are trying to get him back and this is likely to push him further away from you. Let him know that you have accepted the break up by being the mature, responsible woman that you are. Acting like a child who has had a toy taken away from her is extremely unattractive.
Don't hide at home all of the time. Go out with your friends and have fun. Yes, you may see him out and about, but this will show him that you are moving on and enjoying your life. (Even if you want nothing more than to get back with him, it is important to give the impression that you are becoming unavailable.) If he sees you enjoying yourself, he is likely to be reminded of the fun times you had together, and begin wondering why he ever let you go. This is exactly what you need him to do, if you are going to get him back.
Ideally, you are looking for him to make the first move and show you that he is interested in getting back together with you. Let him do the chasing, and don't be afraid to play hard to get. This will make you seem even more desirable to him, since he cannot be sure that you are interested, and he will probably try harder to impress you as a result. Being seen as a challenge is definitely a good thing in this situation.
Show him that you are independent by getting on with your life and making the most of any chances you have. Whether you are taking courses to improve your employment opportunities, or trying new hobbies, it all shows that you are taking control of your own life and enjoying yourself, which is key to getting him back.
Try these tips and you may find he is looking to come back to you and try again to make the relationship work.