Dear natalee:
On Friday he texted you “and said he hated me and said he is seeing someone, and they do not want him to talk to me”. He said that he hated you, meaning that he is very angry at you. Therefore, what your friend told you makes sense: that he tries to hurt you because “it makes him feel better”, and he wants you to “feel the pain he did”.
In that case, there is nothing you can do about his hate for you because he texted you Friday that he is seeing someone and he and that someone do not want to talk to you (“and they do not want him to talk to me“).
I hope that you are not obsessed with your ex, thinking about him almost non-stop, etc. (“I still have our pictures by my bed and think about him everyday”), talking about him to anyone who will listen, etc. Are you obsessed with him?
anita