Why are men so hurtful

Why are men so nasty after a break up? I'm hurting enough and know he hates me but why then continue to send me hurtful messages and songs? Just stamping on the broken pieces of my heart it's not fair...if there no hope of getting past this why can't he just let me be, leave me to grieve? Why continue to hurt me I know it's my fault but you did wrong too, many many times and I forgave you!! If you don't wanna be with me stop messaging me