Hey there K - I am so sorry you are going through this! I wanted to post to you because I have been following your situation so closely since MY sitch is so frighteningly similar. My H moved out and then did the "family time" with son and I on and off for the past 12 months or so. He was EXACTLY like your H in that there was no physical or emotional contact or intimacy. NONE. If we slept in the same bed, he would avoid touching me. Obviously sex was out of the question. All along, I have felt like there was another woman in the picture. Some suspicious evidence, but no real proof. However, after reading what has happened to you, I am now convinced he's been lying to me for the past fifteen months. I don't know if I would really want to see concrete proof like you did or not. I still think that I would no matter how much it would hurt. He swears there's nobody else. I guess they feel like they can't tell us, but Oh My, how much more pain they cause when we find out anyway! The betrayal is impossible to cope with. My heart is literally breaking for you, one because you seem like such a wonderful person, and in no way deserve this, and two, because deep down, I believe the same thing has been going on in my life. I just want the truth. It sucks beyond belief.
I am choosing to let my husband go, stop this limbo madness, since his heart is not in this anymore. He says he sees no real reason to make decisions yet. I feel like he's stringing me along until he develops something stronger with her. I won't allow that to happen. I don't want us to stay in limbo until one or the other gets serious with another person and that is how it ends. I want to end it now. As I know you were planning on doing due to the inaction on your husband's part.
But even though I am ending it, I still struggle so much with wanting to find out the truth somehow. I am not sure why.
I have no words of comfort for you, others on here have expressed themselves so wonderfully. Just wanted to let you know there's someone else out there who feels your pain and is thinking of you. Hugs.