I am in very similar situation, but no children are involved. Wife is madly in love with a former boyfriend who was recently divorced. I did read DR and am trying my best to move on, she only told me of the divorce on 12/25/15 and admitted to the affair after I found phone records on 1/10/16. I guess they go through an emotional detachment and then justify the affair with some pretty fuzzy logic.
It hurts a lot, don't know for how long, but I still have trouble sleeping and assume it will continue for months. I just try to exercise, eat right, and stay busy with friends / conversation / cleaning / organizing house. It's a long road ahead but you can make it a positive outcome by focusing on YOU.
M 43 W 45 M 10.5 T 15 S 26 D 17 (previous relationships) ILYB 12/25/15 + asks for D Confirm affair 1/10/16 W has D ready to sign, but agrees to wait for refinancing to go through (I get a house!)