Plungers do often take care of many issues. I’ve also used them, myself. I always try to keep one in the bathroom just in case, because you just never know.
However, this isn’t about plumbing, really. It’s about your relationship.
I don’t think he’s ever going to change. He is so unreliable. Why count on him for anything, since he’ll only make excuses and just when you are counting on him and need him most is when he won’t be there for you?
Besides the passive-aggressive tendencies, he seems to be quite narcisisitic, …and have difficulties with sloth, but not care about any of this.
Are you codependent? Have you ever discussed codependency with your counselor?
If it turns out your are, are there an Codependent’s Anonymous (CoDA) support groups in your area. If you turn out to be codependent and can’t find any CoDA, there is also Alanon, which deals with roughly the same issues as CoDA.
I wondered about your background. A lot of codependents were raised by alcoholic parents, but not all. Some were in large families or have a disability.
With codependents, boundaries are something they need to learn, so I’d agree with another previous post.