I don't mean to demean you, but welcome to our world. He is isn't your H right now. Read through my threads and you will see I was where you are not too long ago.
As far as keeping the kids away from the OM, the only thing you can do is file for a legal seperation and get a custody order if it is allowed in SC. The order can specify that the kids cannot be in a residence where 2 unmarried people are sleeping.
We are here for you.
Me: 44 S: 17 and 7 Final-6-13-08 I once went to a psychic who told me I would soon feel cheated......