The Prophet (may Allah's peace and blessings be upon him) did not take a second wife until Khadījah died

The Prophet (may Allah's peace and blessings be upon him) did not get married while Khadījah bint Khuwaylid (may Allah be please with her) was his wife until after she died. This attitude implies how much the Prophet (may Allah's peace and blessings be upon him) cherished Khadījah, his first wife.