I know this stinks. Growth from within yourself stinks sometimes too because the growth comes because of something you don't want.
My EXW's affair dude was a friend as well. was in my house many times watching football etc.
So I know the punch in the gut, the pain, anguish....all of it. I know!!
What I will tell you is this. You will grow immeasurably, you will grow stronger, you will look at life differently. There is life on the other side. I know you may not believe that but I wanted you to know from somebody who has been there.
As Cali mentioned. Some fill the void with.....whatever. Fill the void by becoming stronger, answering the tough questions about yourself. Little by little you take back you. This is not a sprint. It is a long trek but so worthwhile.
Just know we are here behind you. We have taken this journey and are here to give you a lift or just listen if necessary.
You are on the right path. Don't be too hard on yourself.