My WH was cheating on me while dating, when we got engaged, and after we were married. The witch was at our wedding!!!!!
I found out about it three years after our marriage, and I, too, didn't know how I was going to explain it to my parents. I felt like I needed to work it out, since it was over and our M was so new. We fought all the time, too, and I constantly made him mad. His son was another factor in my staying, but that proved futile and is another story for another time.
Now here I am 12 years later and going through the same Hell again, only this time I have a daughter with him and I can't just cut him from my life. My parents would be devastated to know that they were part of the reason I stayed the first time. They love me, and they would have totally understood my leaving, just as your parents should understand and support you.
This is NOT your fault. Your WS is broken inside, and he doesn't want to admit it, so it's easier to put the blame on you. Please don't back down or get sucked back in, because he is not sorry you are hurting, and he is not sorry he did it. He's only sorry he got caught, and that is not someone worthy of you!!
I am so sorry you are here, but I am glad you found us. Please post here as much as you need. We have your back!!!