Ditto what Spartan said. No way to keep OM away. I get it, I do. But, you can't. Blaaaa
Your kids are old enough to see what's going on.
Focus on who you want to be, feel the emotions and sit on a reaction. I even say now, "I need some time to process this, I'll get back to you." If it's something I know I'll be super emotional about, email email email.
M: 9 yrs T: 13 yrs H:34 Me:35, S4, D2, S 7 months Dday 11/12-PA & multiple PAs Dbing 12/12 S 1/13 7/13 H moved back in basement. 8/13 #3 born 10/13 still cheating 10/13 He moves across country, I file for D