Man, you have a fertile imagination. Stop it! Just because she's doing jello shots with someone doesn't mean she sleeping with him.
And are you snooping? Stop it! It does you no good.
Stop focusing on her. Especially stop focusing on her infidelity. What you focus on, grows.
Focus on yourself. Focus on being a better man. Detach from her. Don't let her moods affect yours.
Step back from your relationship with her. Way back. Make a plan to improve yourself. I know you have the 12 step program - keep working on that.
If all the time you spent worrying about what your WAW is up to was spend detached and improving yourself to be a better man, then you'd be doing better.
Like others have said, she'll do what she wants and you have no control over that so let it go. Be zen about it.
Focus on yourself. (Oh and on your kids)
M: 59 W: 53 M: 9 yrs T: 14 yrs No kids together but D30(hers), S27, S24, D21(all 3 mine) W moved out 11/18/2013 D-Day 12/14/2013 W moved back home 12/1/2014