Sorry to hear about your situation. Without sounding patronising and judgemental about your relationship breakup, I want to reassure you that it is normal to feel how you are feeling now. We all make snap decisions in such crisis circumstances including wanting to commit suicide. It might be helpful to think about what might happen to your family, friends, etc. After reflecting on the situation, if you still feel suicidal with other symptoms like low mood, no interest in anything, no energy, etc I suggest you speak to psychiatrist for assessment and treatment. Best wishes