He only needed her. She had to stay alive, healthy, and happy and he could die to keep her like that.
They had this mutual understanding.
Even if they didn't tell each other "I love you" frequently or show affection in front of others, they knew what their partner was thinking.
Their love was expressed with action – caring, affection, trust, desire, peace, and friendship.
However, never in his life had he thought that she would attempt suicide if he was gone.
This recklessness surely could be done by her.
However, something about this tugged at his heart string and he didn't know what to say.
His beloved, who never expressed her love properly, showed him her most vulnerable side. She made him realize that he was the most important existence in her life.
How could he not love her deeply?
When he thought about a life without her, he knew he would choose the same as hers.
He simply couldn't live a life without her.