Depression and emotional affair, is there a link?

Hello, My husband has been suffering from depression since he was about 6yo. At the age of 17 he started masking it with marijuana use. In November of 2011 I had to have an emergency hysterectomy, my husband couldn't handle me being down, so he got angry and did not support me through this trying time. My surgery caused me to need to collect disability as I have the higher paycheck we relied on this to keep the rent paid. Unfortunately for some reason I was ineligible. So we lost our house and had to move in with friends with our four kids. 3 months later my husband was so extremely suicidal and had stopped taking the meds he was on. I took him to the hospital 5150'd him and spent the 72 hours following with no sleep and searching for a treatment facility. I found one about 50 miles from us. He was there for a month and my kids and I visited twice a week, once I went alone and it was a very romantic visit. We discussed our lives together once he came home and the changes we would make, etc. It was nice. He has been home a year and we have been having serious problems with him not being involved in our family's life. He has only had a job about 2 months which has put a huge strain on the family over the last year. In the last week I have uncovered an emotional affair that he has been having with his ex girlfriend from before me (20 years ago). It is mainly email only, he has seen her 3 times, one of those times she visited him at the treatment facility. This devastates me. He is telling her he loves her and that he cannot wait for all the kids (she is married with two) to grow up so they can be together. For the last week we have been going around in circles, him saying that he wants to try for us, then not. He keeps saying that I have been unhappy for a long time so why do I want to try? I want to try because he is the love of my life. And what he has with her are just words. I AM REAL!!!! So he is not willing to give up the email relationship with her, but says he will go to counseling. I am so at a loss here, could this be a symptom of his depression?

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