I felt sorry for zero , how come he would life whit someone not even love you back

She did loved him but she didn't want to hurt him because she couldn't get over kaname

um can u tell me in last chapter why zero was covered in blood and why he was happily dieing in sun and did he meet his son please tell me im dieing when did there relationship start when yuuki best friend died? please tell me please tell me im going crazy ╥﹏╥ Σ(っ°Д °;)っ （/TДT)/ there so many things that im confuse