Can a marriage be saved thats full of lies,betrayal and violence?

I have been married for two years and have to say it has been miserable..my husband and I fight with no resolution and it seems to just be a rollercoaster always up and down. there has been domestic abuse mentally and physically ...he physically and I mentally ...he has had side relationships though he said never physical and I have seeked comfort as well ending in an affair I told him about .I have a child in the middle and want him an my husband and I to be happy. I love my husband and can't find the strength to leave can prayer or counseling or anything help...when is enough ...enough ?