My ex's bday wish?

hi guys.
me (23) and my ex boyfriend (23) broke up two weeks ago. it was a messy break up. he literally blocked me everywhere. saying he never wants me to call him again, etc.

we only dated for 2 months.

yesterday was my birthday and he unblocked me wished me a happy birthday (i suppose cause it was a deleted message already when i saw it) , he deleted it and blocked me again.

an hour later, he unblocked me everywhere, even from instagram and stuff.
so i don't understand anything from this situation.. what he might be thinking?
My ex's bday wish?
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