Definitely go with the MB approach!
The therapists only make money by having you both in there and when a couple divorces, suddenly they have two more appointments and then there's more and more therapy for THEM to need to give.
Fwiw, I went to a marriage therapist BEFORE i found MB and I can attest they are not in the marriage saving business at all.
Now go and do what Mel said. Become proactive and read all the articles here. "Surviving an Affair" by Dr. Harley needs to be at the top of your reading list and you need to check out our forum dedicated to snooping here too!
You cannot combat the unknown enemy. Snooping is your right as a spouse, esp if your husband is soon to break your marriage vows. He's like an alcoholic waiting for another shot. A drug addict looking for the next high, except HIS high is the chemical feel he gets from the new fantasy he is involved in. All the new praise, the newness, basically.
Reality paints an affair in a much different light. You need to snoop, do take that one small bit of advice the therapist gave you, be your best self, but combine it with plan A from MB! You are loving, kind, make yourself attractive for him, and refrain from any angry outbursts...all the while you DO snoop, and you get ready and gather all the info you can on the ow and her life.
Who is her H? where does she live? Who are her FB friends? Gather a list up of who you can expose their sleazy fantasy to and at once...EXPOSE it!
Why do affairs die most of the time after a gargantuan exposure? Easy. It shows the world what an affair really is. It is ugly. It is based on lies. It is something that kills marriage and families, breaking hearts of not only spouses but innocent children.
When the rightpressure and exposure is put in force, it's like turning on the lights in a room full of cockroaches. They run from cover and scramble away.
You are in a prime condition for plan A and exposure because it hasn't gone physical yet..but DO snoop and do not be afraid of anything you find.
We're here

And MB works!