Hi, I understand what you are saying and feeling. The very fact that you wrote this means you are still hopeful. Suicide is not the solution. Rather both of you dying does not make sense. Kindly seek expert help. This is for both of you.
Next Steps
Kindly meet a psychiatrist for depression and relationship counselling
Health Tips
Kindly confide in s close friend or a person you trust. If not possible get professional help immediately. Kindly don't play around and waste time.