I am setting boundaries on the use of my time, and my availability to others.
Personal priorities aren't relationship boundaries. You aren't in a relationship with yourself.
Let's try this differently....
Let's imagine you had a friend or colleague that constantly complained about her marriage. The problems, no matter what they are, are always her husband's fault, and she always presents herself and her reaction in the best light. At no point does she ever describe herself as being at fault for anything, nor doing anything wrong, nor does she ever mention how any of her behaviour ever affects her husband. In fact, apart from being the constant source of misery in her marriage....all you know about him is the fact that he works a job, and he provides for the family/marriage which is why she explains she cannot leave.
Would you be more likely to think....
1. She's in an awful marriage with an awful man who is clearly abusive, toxic, problematic or otherwise genuinely the source of all her problems and she should be planning on how to leave this situation or possibly set some real boundaries about his behavior?
2. That she's a completely self absorbed, delusionally narcissistic, or possibly simply far too immature to be in a marriage and potentially the source of her problems lies in a complete disregard of how her husband feels, his needs, his concerns, and the way the her behavior, her actions, and her attitude might be affecting him?
I know that's sort of a difficult abstract question but do try and answer. Maybe you would try to find out some of these things about her husband....but she quickly obfuscates and returns to talking about herself as if she's always in the right, always the victim.