For this to manifest into words to you there has been a great deal of thought and action that has already happened to get to this place.

She is already cheating on you mentally and if not physically yet?....it is not very far away.

If she cares so little for your vows and the sanctity of your marriage it may be time to seek help or separate.

If it were me I would check her phone and computer traffic and then that will give you a better choice.

Myself...this would spell divorce and I would not want to be worrying about a lying cheating ingrate in my bed or home anymore.