My boyfriend confessed something questionable, what should I do?

Anonymous
My boyfriend recently told me something bad that he did as a child.
When he was 12 years old, he would take his autistic, non verbal 8 year old sister to the bathroom and undress them both. He said he sometimes put her hand on his dick too but that was it. I dont know how to feel about this. At the time when he told me i didn't react much at all but its in my head now
My boyfriend confessed something questionable, what should I do?
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