Becky is right, depression does not discriminate. It chooses whoever it wants. And there is no getting away from that fact.
I would suggest some counseling for this. Possibly medication, but the counseling might alone help. You have done nothing wrong. You are a good person, especially for loving a child that wasn't yours. And I hope that you are able to be a good influence on him and can spend quality time with him. As for the mother, she sounds very selfish. I would limit my time with her. Just see your son.
You are going to meet all kinds in your life. Women who are good and women who are not. It is up to you to choose if you want to. Hopefully you will meet a nice lady and have a fantastic relationship with her. When the time is right for you.
I can't say enough how I admire you taking care of your son. And yes he is your son, even if the dna isn't the same. He looks up to you as a father and that is what is important. You are a good person. Never forget that.
I hope that you feel better soon. Check out the counseling. Keep posting and let us know how things are going.
Take care, best wishes to you.
Moderator-Depression and fibromyalgia
fibromyalgia, Chronic fatigue, depression,allergies