I agree that you should stay put. Why should you put her needs above your own and the children's needs when she doesn't reciprocate? She is not looking out for your or the children's best interests right now, and she will not appreciate you more for moving out - meaning, it won't save the M. You will shoot yourself in the foot if you move out. This is valuable time for you to remain in the same house and divorcebust.
You may feel like you have ignored her needs so now you should do this, at least - but it is not the right need to fulfill.
If she wants space, she can move out and you can stay with the children. Why do so many men assume the children go with the wife?
*She* is the one who wants to leave - not you. She can find a solution if she wants. You don't help her reach a goal that you don't want. Let her live the consequences of her choice.
Was the advice to not move from a L? If not, talk to one so you are prepared for what *might* come.
She can't see you as sulking if you are neighborly friendly with her when you interact, but keeping it brief is best. Her curiosity is a good thing.
Can you say a little more about what was wrong besides the porn? You said she wanted male attention when she felt unwanted - did she feel unwanted by you?
M 16 yrs, WH62, P54 3 adult blended kids EA 11/13, BD1 6/14 PA fall 14, BD2 2/15 Piecing 2015, BD3 12/15 Separated 4/16 WH moved OW in 5/16 Divorced 6/15/17