You will find you have to dbust friends and family as much as your wayward spouse in some cases...
The process is the same.
You hear the same excuses 'he's in love" or "he said its over" and the unforgettable "he's not in love with you"
It's all lame excuses... don't accept them from infidelity supporters anymore than you do from your husband.. challenge it outright, with maturity.
You educate, challenge, and stand firm in your position... constantly throwing bricks under the wheels of the infidelity roller coaster... In many cases I have seen this derail it entirely... It takes time and a lot of perseverance...