OK.. Since this is a genuine question, it deserves a proper answer.
If I were in this position, I would honestly leave the relationship behind me. If you can't trust your wife, then who can you trust? A relationship should be based on love, trust and honesty. If trust is broken and honesty is out the door, what's left? Love is hard to have after somebody you you cared for stabbed you in the back.
On the flipside, if you've cheated on your wife before, then this is just karma that was bound to come sooner or later.
Regardless of the situation, don't resort to violence. Just be strong, walk away and let it all straighten itself out.
I'm sorry to hear about this.
