DID XH M OW or not??

[peacetoday]

Facebook no I dont get on there

so question::
XH has started to tell kids about OW
how wonderful she is
she has a D11 who lives out of stste( obviously she abandoned the child)
that he may Marry her
a;right he already did
so MY D 14 thinks dad seems happier now than before
He appears to be sober and much better than before
he seems more available to kids

NOW QUESTION:
What would you guys do at this point about OW wife
XH is not going to say we had an affair
MY new wife helped detroy our family
she abandoned her own child
she sometimes smokes drinks ect
shes only 28
Do I let my d14 go into this thinking they just met??
Is it my place to tell her
MY D is innocent and youbg for 14 she will not suspect or even understand what cheating meansd
or at this point do I start letting it all go and just let my kids *AND ONLY FOR THE KIDS SAKE)
BELIEVE THEIR FATHER IS A RESPECTABLE MAN AND HIS NEW WIFE IS OK