Love is also a very chemical phenomenon. The bondage that happens between two people is not easy to let go or forget. As there is suicide ideation is better to see psychiatrist for initial phase. The Medication will also help you to moderate your thoughts. Later with support of psychiatrist or psychologist you can get counselled for this. The treatment plan would mostly be to distinguish between need of love and want of love. How you can manage your thoughts so that you can feel different. And different action plan for further action.
Next Steps
See a psychiatrist first and discuss about both suicide ideation and low feeling.
Health Tips
once you get out of this emotional turmoil with psychiatrist help you can easily figure out different ways.