I think this means he is guilty and tired of living with a dark secret that he believed couldn't be controlled. Sad.
Possible - anyway, he took a 'Permanent Solution To A Temporary Problem'.
(imho) -- He took the Coward's way out. . . .
IF Guilty - this could've been worked thru - somehow - .
IF Not Guilty - Then there should've been nothing to fear (for the most part).