So if you decide to take the option #2...this is what it should look like:
NEVER talk about the affair...refuse to. And do NOT talk about separating or divorce.
Start going to the gym and working out every evening...take your time there and even have a shower before returning home.
Change your diet to a more healthy one...do your own grocery shopping.
Go to other events of interest and do NOT announce your comings and goings.
Keep your cell phone on you at all times.
If she texts to ask you where you are and when you are returning...answer her truthfully and BRIEFLY.
Start dressing differently and wearing nice cologne when leaving the house.
Eat your meals sitting in your recliner rather than at the table with her...cook your own food if she does not have it ready when YOU want to eat.
Do your own laundry.
Don't start a conversation...if she does, answer questions using only one word if possible...otherwise just say "I don't know" or "I would have to give that some thought".
If she tries to rope you into an argument, get up and leave the room...if she persists, leave the house and dont come home that night. Tell her that there will be no arguments worth having.
Don't look at her, don't compliment her...but thank her if she does something for you as you would anyone else.
Get back to your computer and contacts in your area of interest and limit that time to one hour a day...but do not go on dating sites or anything remotely like that.
Cancel all credit cards...get one in your name only. When she asks why you did that, tell her "I do not like the interest that I am paying".
Do NOT ask her if she wants to go out or do something together! If she asks you, politely decline and say you will have to take a "rain check".
If she tries to initiate affection, be "limp" and unresponsive (do not embrace her...leave your arms hanging down)...if she asks what is wrong, tell her that your feelings no longer seem to be "on board".
If she manages to seduce you into sex, make it last just long enough to get yourself off and do not cuddle...instead, get up immediately and have a healthy snack. Do not ask if it was "good for you" or thank her in any way.
If she asks if you wish for her to leave...tell her that is entirely up to her, but inform her that you wont be able to support her if she decides to.
If she claims to be the only one putting out any effort...tell her that you "are trying your best".
If she starts going out herself or otherwise making you feel as if all is lost...IGNORE it and ask no questions...make NO comments.
If she leaves, she was never serious about doing her part to make any concessions to remedy the breach in the marriage...and you are now off to a good start for your own future.
You are supporting her financially...you should be getting far more for those contributions and efforts especially after her affair and lame "efforts" to keep the marriage...like a loving wife for starters, and plenty of sex too. If she does not grovel to the point of being willing to do that without you asking her to, she is simply using you to stay under the roof...so make a new life for yourself whilst she does, right out in the open and in her face.
NOW you will be in the driver's seat at last.