The blame game is a constant battle I deal with in my sitch. What works for me is ownership for myself. I say I am only responsible for myself and my own actions. I am proud of the good and sorrowful for the bad. You can leave it at that or if you need to reinforce something you say Spouse you also are responsible for yourself, your own feelings and actions.
Hope that helps.
H(37) W(35) D8, D5, S3 T20, M13 BD 8/31/18 EA Discovered 9/13/18 Mediation 10/3/18 W files for D 10/12/18 W moves out 11/10/18 EA confirmed 12/25/18 D Final 1/10/19