been there a couple of times mate,you'll start seeing more bad in your wife on purpose just so the new woman looks better for you, you'll probably start arguing just for the hell of it,again so the new woman will look better in your eyes.

All this will happen and you wont even know that you're are causing the hassle.

My advice, stay away from her,if you want to chat pm me,although im off out soon so will read it later.

Best of luck mate, i know its hard ans awkward.