Should I bother filing for a divorce on the grounds of adultery? can alienation of affection be charged on her?

My husband filed for separation in Sept. He has moved in a female around Thanksgiving. We've been going back and forth about reconcilation but I have decided he keeps lying and I can't trust him so forget it. We have a 6 mth old son together, first for both. Obviously, in a year I guess he then puts in for a divorce.