They say bad things happen for a reasonBut no wise words gonna stop the bleedin'
This lyrics emphasises how anguished the singer is and how he is convinced that no advice/anyone can help mend the mental suffering his going through. The word "bleeding" signifies the deteriorating mental state of the singer and that he is depressed. This reminds me of the theme of depression, to which you feel that theres no hope anymore in the world and theres no point of living. This shows how important his ex is to him