a horrible night

i feel really sad and hurt tonight.my 12 yr old son who was sexually abuse by my sister's husband told me he hates me and that he blames me for everything bad that has happened to him.he said he wants to go stay with his dad but his dad always has an excuse not to take him.but my son still thinks he is the best dad. i just hope that my son would realize how difficult this is for me as it is for him.i know he is the victim of the abuse but i deal with it too.i think about it everyday.it has broken our family.my sister hates me,i seldom see my mom anymore,my other sister is too far .my mom and my aunt thinks that i should just drop the charges and just forget about it.but i can't.what would that tell my son.that i don't care about him,that he doesn't matter???i really don't know what to do anymore.