Spouse issues

After my kids delivery I had issues to adjust with my in laws. I was going through postpartum depression. During this period I had some conflict with my in-laws and have stopped communicating with them as can't take it anymore. During this period , my husband was very rude and had a extramarital affair with bar dancer. I came to know and after confronting, had lots of fights and heated discussions. I was blamed for all that has happened. Now my husbands treats me like and outsider and does not even communicate or talk about anything. His friends know more than me about what is happening in his life. He has started keeping secrets and does not treats me like a wife. For him I am a burden. I am not able to take this anymore. I don't want fake relationships. We have a kid with autism and we are staying together only for him. I need to understand what best approach to deal with such situations where you are not even being treated like wife.