Is his new relationship a rebound?

We broke up 2 months ago, stayed friends, he told me he misses me, misses my hugs, wanted to have sex with me again, and wanted to meet up, even offered to buy me drinks. Then the next day he got with some girl who he told me they're just friends and she's not his type anyhow. He turned on me, sent me pictures of them together.. then he blocked me from messaging him but didn't block my whole facebook.. so i can still see his facebook page. And he changed his profile picture to them two.
It seems as though he's using his relationship as a way to make me jealous.. but im not 100% sure.
Is his new relationship a rebound?
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