She is happier without me?

After my girlfriend of a year and half left I am left devastated. She posted on Facebook how she is completely happy about her decision and is happy in general. I feel betrayed because when we were together we made plans for weddings, we lived together, I almost proposed to her, we talked about the future of us and for to say that she is VERY happy being away from me is leaving me depressed and anxious. Should I be happy for her. I know I should but I'm not. I want her to be miserable without me like I am miserable without her. Am I selfish
She is happier without me?
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