Dani, allow me to share what worked and what didn't work for me.
The DB coach's/MWD's advice on simply ignoring the affair did NOT work. That simply allowed BF to cake eat. Of course he's not going to choose one woman when he can have two. Additionally it made me feel like crap knowing that I was being disrespected so horrendously and just sitting there taking it.
Eventually I decided I had enough. I told him I would not live in an open relationship. He continued to see OW so I put him out of the house and ended things. Then I completely focused on myself and immersed myself in GAL activities. I only communicated via email regarding business issues. This DID work. About five weeks after I put him out he said he wanted another chance. I told him no until he had stopped all contact with OW and was willing to do whatever it took.
So yes, you will receive conflicting advice. I advise you to read through and see what is working for others and use that in your own sitch.
If you love somebody, set them free. http://tinyurl.com/2empx2g