How do you guys cope with devaluation phases? Because I don't think I'm equipped for when it comes
I cope with devaluation in by practicing mindfulness. First, I try to get into wise mind. I tend to let my emotional mind eclipse my reasonable mind when I am being devalued. Wise mind is a balance of rationalization and emotions.
During periods of devaluation, I take a moment and step back, take a few deep breaths, and think, yes I am really upset with what he is saying to me, but this behavior is a part of BPD. Having knowledge of BPD really helps with that. Once you cope with the devaluation this way, you become conditioned to be almost "desensitized" to certain behaviors.
I understand how you feel cynical and hyper vigilant. If you continuously have this viewpoint it can be like you are setting yourself up to fail. PwBPD tend to be overly sensitive to feelings and their environment and usually can tell when you are on edge. As you said, take some time to relax and read the lessons.