The "good bye" was certainly not what you hoped and unfortunately would not have been as those "fairy tale" endings generally are for in hollywood movies. Even if he stopped you and spun you around and told you not to leave, that he had changed his mind... it probably would have been a good idea for you to continue on, anyhow. The two of you really need to dig deep, work on yourselves, and see if you could eventually have a new and better M.
He really does believe that he simply fell in love with someone else. He likely does not realize that it did not happen spontaneously, that he actively pursued someone else. And... that what he is feeling, is not necessarily love, rather some variation of appreciation and lust. Statistically, affairs do not end up surviving and being long term. Once reality sinks in, his A is likely to end.
So, it still puts you back to working on yourself. Grow and become an even more awesome woman whom only a fool would leave. Keep the focus on yourself, GAL, do any 180s that you feel are important. It could help save your M and at least it will help you in any future R or M, whether with your H or with someone else.
