I can tell you with absolute certainty that computer evidence matters. I happened upon computer initiated infidelity too. Made like I didn’t know, so I hooked up and analog recorded everything she did online in real time for 2 months. Chats, IM’s, email, plans to hookup, everything. When I confronted her with it all, I showed her what I had, with divorce papers all signed by me waiting for her signature. She went to a lawyer and came back with the papers signed, she really had no defense and moved out the next day. So if that’s a possibility for you then I think your therapist is correct.