I would echo and amplify something Brit said in her post.

Go find your bliss. Do things you find interesting and makes you happy. Here it will also be referred to as GAL.

This doesn’t mean you are walking away from your marriage. You are walking toward your happiness, your confidence, your swagger.
Make it for you, make it real. You are changing you, for you, for your happiness.

The message you’re sending is I accept this situation, and I refuse to be dragged down by it. I do not need you to be happy. I make myself happy. I am moving forward to my new happy life without you in it.
Sending this message without rancor is the goal. That you are in MC should be enough of an indication you wish to work on continuing. Don’t belabor this or pursue.

If you have not already done so find the sticky about the 37 rules and digest them.

BITS
Me 55, ACK, when did that happen? Doesn't feel like 55
D 30
S 27

You create your own universe as you go along - Winston Churchill