I agree with Starsky. In my sitch, I had discovered an EA in March '14. I confronted my H and he ended things with her. But unbeknown to me, they started up again 2 weeks later. His communication with her was purely using work emails/phone. I had access to his personal phone. But he changed the code on his mobile device and told me I shouldn't have access to his work stuff anyway. He got really cross about my anxiety and snooping, and I doubted myself.
Guess what? The EA developed into a PA. Starsky is one of the vets I mentioned. He's extremely experienced and knowledgeable, and I would seriously think about following his advice. A strong stance is needed here IMHO.
Best of luck with things - keep posting my friend.
T 13 M 7 Me 48 H 46 SS 15 BD 7.14 PA D final 5.16 (H filed)
We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus