This sounds so straining and stressfull. How hard it must have been for you to partly stand on the outside and at the same time being brought into their problems by them both.
What he did to you is horrible. He sounds like an abusive monster, this scary man.
I`m very sorry this was your first experience.
It was a hard story to read, and I cant imaginne how it was for you to live it.
Good luck to you in the future, not everybody is as foul hearted as this man, I hope you will find your way back, your trust and your hopes fulfilled.