I felt the same way.
My wife at least on the outide seemed proud that she walked out on me and our 4 kids among other things. It was worth because she found happiness.
But me....I felt ashamed. I felt like a leper.
I have friends too that I drove away because I wanted to talk about my feelings of loneliness and betrayal every day. I wanted to release it, I found out I was really alone. People ask you how you are doing...they do that for themselves because they want to smile and say good and you ask them the same thing. They really dont want you to unload on them.
My wife left and we use to have sex four 4 years after she left. She even had boyfriends, but she kept coming back to me. Then she met a guy 24 years younger than me, she told me she enjoyed sex now more than ever. Our sex life was great and so good she would sneak around on her boyfriends to have sex with me, even though I was her husband, how messed up was that? I am right there with you