What the hell is he playing at?

My ex and I were together for 18 months, and we lived together. We separated a month ago and he is already in a new relationship and posting pictures with the new woman all over social media.

The relationship ended on very bad terms, I highly suspect he was messing around and caught him in several undesirable situations, in the end anger got me out and I left. However, I left a few things in our flat in my rush to get out and he had told me he would mail them to me, but that has not happened.

Now he has removed me from his social media, but still has my stuff. What do I do?
What the hell is he playing at?
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