Confused and worried about my marriage. Can't figure it out.?

My wife and I have been married for six years. During January and February things seem to be fine. We say we love each other no major problems. To be honest we have coexisted for six years. Spats here and there but good times also. During the month of March my wife has been going out coming home at 2:30 am and stopped talking to me. I haven't cheated, I don't drink, and I don't' abuse her. She remained tight lipped for a month until I asked her was she seeing someone three times. Each time she said no. One time while talking she mentioned feeling smothered and lonely. I realize I haven't paid her any attention because of selfish reasons. I expressed to her I would like to go to counseling because I have trouble expressing love and we have always had problems communicating.She says she wanted to separate form me because she isn't feeling it anymore. I suggested counseling and she states she is not there yet with me. But she wants me to leave the house. That is crazy I am not the one wanting to separate I want to get help. I love my wife and want to save my marriage and work on my problems. It is hard to understand because I didn't do anything to precipitate the sudden 360 of her emotions. I feel she is seeing someone. She denies it. She still wears her wedding band. One night she went out and left it. Is this a spell or what. I can't read her. I reached out verbally and email and no response. One night I tried to hold her and she got upset and went through the separation speech again. She said she had seen an attorney. I told her I would not agree to anything until we have exhausted every resource to save and strengthen our marriage. I have a step-son very disrespectful and manipulative who has been a problem for 6 years and she defends him - single mom. Women especially unique child help me figure this out. Is this a spell or should I prepare legally and can I get a court order for counseling. Help Please!!