this was my experience some 5+ yrs ago.
I asked and asked him to tell me.
yes we'd been under pressure, new baby etc, work. He'd started to withdraw about 6 months earlier, but I never doubted that underneath we loved one another.
We were so very close, and very good friends.
After being a member of mn all these yrs, it does make me wonder.
oh, 6 weeks later he told me he had met someone new.
A couple of yrs later we had a disagreement about something, and i said, well of course i feel like that, you left me for someone else.
Still he denied it.
wish i knew for sure. as it was the biggest shock of my life :(