From what you are describing here, it seems to me that your change in attitude and communication with your father are stemming from the fact that your mother confided in you about her marital issues as a friend, not a daughter. If your father truly has Asperger’s Syndrome then he has always had it, it is not something new. It could also be that his way of communicating has become more irritating to you as you have become an older teenager, in that there may be more things to disagree about, such as curfews, boyfriends, etc.
However, your mother should not have put you in the middle of their marriage. It is not fair to you. I suggest that you put a boundary in place yourself and let her know that she needs to talk to her friends or a therapist about her problems and that you want to stay out of it. In the meantime, I hope that you will try to find a way to reconnect to your father. Start by spending time together doing something you both like so that the time will be focused on an activity rather than relying on conversation. It may also help if you gently let him know if he hurts your feelings or upsets you and suggest an alternative way of asking you what he wants to know. Considering that he will always be your father, regardless of the status of their marriage, it might also be a good idea to have some family therapy sessions together to help improve your relationship with him.
All the best,
Dr. Holly Counts