I am sorry to read about your breakup. The hurt that comes with a breakup or a divorce can be as serious as losing someone to death.
It also brings on a process of grief. Grief has everything to do with your feelings. You don't have to fight or subdue your feelings, it's normal to feel sad, angry, lost etc. At different times you will feel different emotions, none of it is wrong. Just keep on going day by day, it will get better. Thinking of you.