I am living in a nightmare right now

I am absolutely devastated and living a nightmare right now

July 1st I found out my husband of 10 years and over 20 years together has been cheating on me for over 2 years in my own house

I found out that the asshole has been having an affair with my so called friend who was like an aunt to my child and was also in my wedding party.

To top it off I’m also 15 weeks pregnant and I feel like my entire life and marriage was nothing. He feels bad and wants to work on things but how in the hell do I get this disgusting picture out of my head of them together

I have no clue what to do I’m 41 and this is not healthy for me or this baby and he refuses to leave