I wish I had come across your situation sooner. I cheated on my husband of ten years, and the only thing that made me stop was LRT.
That brought reality into the picture full force and woke me up.
I am not suggesting you should expect the same in your situation, but waiting a year and a half to act on this just gives those two cheaters time to BOND and PREPARE.
If you use LRT sooner, particularly in the first six months or so, you have a much better chance in my opinion.
Do it anyways though, even after ten years... use LRT.. reclaim your dignity and respect for yourself.