Simon suicide is never the answer, tomorrow is a new day and could bring happiness, if you are gone you will never find that. I urge you to call a doctor and schedule an immediate appointment, often the sadness and desperation is a chemical imbalance in the brain and medication will help, it may even help your relationship if this imbalance has caused you to act different. It will I promise allow you to look at things through a better perspective. I pray you do not hurt yourself and you at least try to seek treatment. I also urge you to think of the people you will hurt in taking your life. Be strong, pray, and fight through those feelings, call a crisis help line, do not hurt yourself. God only gives us what we can handle, sometimes we think we are overburdened but then light shines and he has come to help us with the load, have faith.