Should I tell him that he hurt me?

A guy did something wrong and hurt me, and we broke up.
I read advices to not show a guy you are hurt, so I told him I loved him and i wished him all the best and didn't think bad of him. And i showed myself happy and smiling.

But it has been 3 months and i am still thinking about it, i think letting him know that he hurt me could help me and finally forget it? I tried writing it down and not sending but this fake closure doesn't work. Maybe I need to tell him my true feelings about what he did?
Should I tell him that he hurt me?
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