😭past sexual abuse help😭

I was raped and forced to do sexual acts on my mothers now exhusband when i was about 11. The abuse went on for 4 years, and then i finally came out and told somebody. No one believed me, and they (doctors) "tested" me, but the results showed nothing since it had been so long ago. And my abuser never suffered any consequences for what he did to me. Amd worst of all, when i told my mom, she didnt even believe me😭. Well here i am 13 years later, and i am still haunted by what this piece of shit did to me for so long. I am now getting professional help for it, and ive been diagnosed with PTSD. It affects my life greatly. I sometimes will have sex with my husband, and the flashbacks come to me at the worst possible time, and my husband ends up feeling like shit because he thinks he hurt me. Im trying to get stronger and not let this piece of shit of a "man" ruin my life, but it is really hard. Im trying to get better. im trying to heal. And recently, it has came into my mind, that if i wrote this "man" a letter and sent it to him so he can knows how he has fucked up my life and my mind, that it would help me in my healing process. What would you do? Write the letter and send it, or not send a letter?