Parents: help me parenting while separated (2)

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I don't know what is going on with me.
I was doing very well, taking care of my things, living my own life, focusing on my kids.
And now, since last week, I have these dreams where STBXW asks for reconciliation and I just send her away, saying I could not possibly love a person who disappointed me so much. STBXW leaves crying.
And the problem is that I take pleasure in that, in making her suffer the same way she made me suffer.
I have also noticed some rudeness in my real world contacts with STBXW: I do not greet her when we meet and do not say goodbye. I have always tried to be distant, but not impolite nor rude.
I hope this is only a phase that will soon pass.