My Husband and Friend's Betrayal

"Oh f*ck baby, I love the way you eat me out," Grace moaned out loud as Orion buried his head further.
My sobs became louder as I felt my heart go through excruciating pain when I saw this.
Orion never did this with me. Whenever I brought it up, he always refused, claiming it felt unhygienic due to his cleanliness.
The longer he spent, the more my sadness turned into rage and humiliation. My body shook with rage, my blood was boiling, and I felt my anger course through my veins.
He teased her as he lay her on the couch and spread her leg wide open, before sliding into her.
"You are so good at this, you do it better than my stupid wife," Orion complimented as he f****d Grace faster.
"Say that again!" the stupid bitch replied, it was obvious this wasn't their first time, I never could have thought Grace held that kind of resentment towards me.
After what felt like an eternity, they both collapsed on the couch, breathing heavily. "Why didn't I marry you instead?" Orion said, giving Grace a peck on the cheek.
"What about your wife?" Grace asked, tracing her fingers all over his chest.
"She's so awful at this," he says with disdain. "Every time I see her tasteless outfits and boring moves in bed, I feel sick,"
I couldn't watch this any longer. My anger was threatening to devour me.
What you can do if you discover your husband and friend's betrayal?