Definitely read the books when they come in and as dbmod suggested the outlined threads. They're great starting points for your situation
As for your situation, have either of you brought up MC? I know you have the information that your H is still texting this OW, but he may view that as snooping and be upset about it if confronted so a neutral third party may be what is needed to air out these things in a manner where neither party can be accusatory or angry.
