I am so sorry for the misery you are going through. It sounds exactly like my brother A's marriage. My siter-in-law was meeting men on the internet. It sabotoged and unraveled their marriage. GRRRRRRRRRRRRRRRRRRR! He died of natural causes at the age of 50.
His pain had really taken a savage toll on him physically & mentally.
In my opinion ya ought to bail out of this marriage for your own sake.
Just my opinion. I wish you all the best!
~Dottie