Second DDay. Is R even possible?

I thought him having an affair was impossible, but it happened. I thought we were taking the right steps towards R. Counselling, lots of communication, he was putting effort in… I really thought we had a chance. Now I found out they’ve been in contact and sexting since I caught them a month ago. Been caught red handed twice.

How the f am I supposed to be able to trust ever again?

Anyone else been in this situation? Any success stories?