The second night I dreamed he called me asking for me back. But I said no, because I have a new boyfriend, and he got mad.
Good morning, Shannon.
I'm guessing that you ended the relationship with your ex fairly recently, because this kind of dream comes from one of two sources.
One is a desire to show up the ex - to prove that you don't need them, and have them grovel for forgiveness. This source is anger.
Another possibility is that you still have feelings for the ex, and are having a hard time letting go of the relationship. This source is regret, or guilt.
As you can see, both these sources are closely related, and both are possible. I believe that, with time, you will be able to let go of the older relationship completely, and these dreams won't happen again.