What can he say that will make this ok? You are not safe. When you said you stayed still at first (before "waking up") what you were doing is freezing. That's what people do when something traumatic is happening to them. It's a coping mechanism and totally normal as a reaction to something THREATENING.
You're hoping that he shows huge remorse and promises never to do it again. He might show and say that. BUT you have no idea for how long he'll stop, so you won't feel totally safe in your bed, because part of you will be alert, waiting.
Please think that every time he touched/es you in this way that he's punching you hard. And photographing your bruises. And filming you as he's punching you.
Any decision you make about your relationship is as a direct result of him. You are not going to break up your family, because by making his wife and the mother of his children intrinsically unsafe, he's already done it. You can try to hold it together - and pretend to hold yourself together - with glue, but you risk destroying yourself in the process.
If he wants your marriage to work and his children to live with two parents he will leave the house and seek proper, intense therapy and not even consider moving back in until a) he knows it's resolved and most crucially b) you can trust him 110%. It's up to him to save your relationship, not you. And you, of course, never have to accept him back, regardless of how much effort he puts in.