My husband is okay with my stepchildren sleeping with each other
my stepson's casual slapping of his stepsister’s buttocks

After twelve years of marriage, my relationship has come to an end. I discovered that my stepchildren have been engaging in an incestuous relationship, and when I brought this to my husband's attention, he brushed it off by claiming that they were adults.
This has led me to question the morality of the family I have been a part of. In retrospect, there were signs that I overlooked, such as my stepson's casual slapping of his stepsister buttocks.
When I confronted my husband about the situation, he bluntly told me that if I couldn't handle it, I should leave.
I am now left wondering what my next steps should be.
source: Ghanaweb