A lonely man committed suicide, why would he do that?\nOptions:\n- suffering\n- he was happy\n- avoid problems\n- unhappy\n- end pain
Please answer the following question by reasoning step-by-step.
unhappy
When a person is lonely, he becomes unhappy.

When a person becomes unhappy for a long time, he becomes depressed.

Depression is the main reason behind suicide.

.

Therefore, the answer is unhappy