Nate, my H was in a secret friendship turned EA for about 2 years with OW before I found out by chance. (OW was an old flame from decades ago when H was single, she was with someone else at the time, so unfinished business, it seems.)
The EA turned into a secret PA for 4 months (all the time, H is lying), then he ended the A and we reconciled.
4-5 months later (H can't say precisely), OW contacts him again (at least that's what he says), and it becomes an EA again for 7 months or so. I found out by chance right before Christmas.
He now says the A has burned out (my words but what he describes) and he wants to rebuild M.
So I'm starting on my 4th year, and H and I are more open and honest with each other than we have ever been, and we fight less than ever - even before the A. Will we make it? Not sure, but I don't want to divorce. I really don't want to.
That's where I'm coming from when I say 1.5 months is a very, very short time...
M 16 yrs, WH62, P54 3 adult blended kids EA 11/13, BD1 6/14 PA fall 14, BD2 2/15 Piecing 2015, BD3 12/15 Separated 4/16 WH moved OW in 5/16 Divorced 6/15/17