I tend to agree with the others on this issues. Although having someone there to keep you accountable is a good idea, have someone like you wife or any other family member as this person can be troubling. It is something I would never do myself.
It is a very good idea to pray together, as we all should, but to confess to our sins to one another, especially a spouse, is inadvisable. One thing that some forget, is the burden that people can take on when they hear something in confidence, especially in confessing our sins to each other, that can lead them to judge or in some instances lead to sin. Now, it can be argued that this person or that person, whomever it may be, would never do that, but in some instances, some people can not help but do this. Not to say that this will happen in this situation, but why put some one you love in this predicament if it can be avoided.
Another point, is the pastoral training and/or professional training that a priest or professional counselor receives to deal with the issues that people may bring up in the pastoral/confessional situation or counseling session. In the case of confession, as an ex-seminarian and a person that has a family member as a priest, I know there is a lot of schooling and pastoral training that a man goes through before even hearing his first confession. For the reasons stated above, as well as many other reasons that would take forever to list, I would never use someone I love as a “person of accountability,” when it comes to my sins or my personal struggles. For myself, I know going to a priest will help me, because I can learn from their training, pastoral advise and example to help me overcome my struggles and sins.
There is a reason why the Church conducts confession the way She does. It helps in keeping the sacrament and the experience a holy and sacred encounter with Christ, and keep the dignity of the person and the priest in tact. Remember, although we are going to confession to the priest in out local parish, we are really confessing to Christ himself.
One final thought. As far as the the person of accountability is concerned, I think this is a good thing in certain situations and some cases, but when it comes to matters of a spiritual nature, like confessing our sins, I would keep it between your confessor and yourself. I would also advise to seek out and keep a spiritual director to help with following God’s will in life and to help as much as possible, with all life’s struggles. Also, as a side note, I find it much more conducive for spiritual direction, if you make your spiritual director also your confessor. It helps keeps everything out in the open, for both you and your spiritual director. This way, you have someone that you can build a history with, that can help in all your struggles now and in the future. Hope this helps. God Bless