Relationship advive?

My ex broke up with me 3 months ago after nearly three years together. Talked about marriage and everything. She claimed to have been going through a curry and depression and wanted to break up in order to heal. Of course I was devastated. Anyway, we've had no contact even though I tried, at the beginning she even said she'd kill herself so I betrayed her and told her family since I was no longer in the picture, I'm sure she resents me for that. Anyway, she posts old pictures that I took of her while we were dating and writes hintful captions. Yet now she also posts pictures with a new guy and being flirty.

My question should I let this go and live on or is she just going through things and this is one of the post break up flings?
Relationship advive?
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