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-What are your ages?
-What kind of negativity?
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Your ex might need some time to figure out what he wants to do and who he wants to be with. He is confused and that is because he didn't have closure in your relationship before he started a new relationship with this other woman. There isn't really anything you can do right now he has to come back to you on his own, you are going to have to show him that you have changed and that if he were to come back things will be different if he sees that everything is pretty much the same it will be easier for him to stay gone. Take this time to work on whatever it was that made him leave. What you are going to have to do is show him what it was that made him fall in love with you in the first place. Do the things that made him want to be with you and spend the rest of his life with you. Get rid of all the negativity that chased him away and learn to be positive about yourself and the relationship.
A letter or card wouldn't hurt just make sure you are telling him how you feel about him and what you had and not begging him to come back, no one likes the needy and you may push him further away if it sounds as if you are begging him to come back.