I think we would need to know why she is so bitter and angry. If it has nothing to do with you then I agree therapy would be the first step. Maybe stepping back from the relationship for alittle while would be for the best too. Also I know My husband sometimes has no clue as to what he has said or done to make me so angry with him...maybe this is the case? I have been married twice before and I am only 29, I have learned with my husband that if things are gonna work we must talk about everything and anything. Just try talking to her and if this doesn't work maybe taking some time apart would be for the best.