"If you love someone and you break up.."
When a relationship ends, it can be immensely heartbreaking. Negative emotions are often demonised and we are made to feel as though feeling sad, angry and hurt is not good for us. That's not the case. You are perfectly entitled to experience and go through these emotions. Talk to people:friends, family members, your therapist.
Whatever happened, remember you are loved, you are important, you are beautiful, keep that heart on your sleeve.