Why would a fuck buddy get jealous?

Anonymous
A few days ago I told my fuck buddy before we hooked up that I had started dating someone (but we're not official/exclusive yet) and he was

-asking to see pictures of him, his name, and where he was from
-calling him a pussy because he hadn't had sex with me yet
-asking if I send nudes to him
-telling me that I'm the best he's ever had and I'm the only girl who can make him cum
-asked if I wanted to adopt his kitten? I told him to ask his friends and he said "no i'm asking you"

A few days after he asked for nudes of me and he has never asked for them before in my 8 months of seeing him. Then he was asking when I could go over to hook up even though we just did 3 days ago.

I told him I would keep seeing him until (when/if) me and the guy I'm dating become official.

I don't know why he's acting like this? I feel bed? Any advice and opinions would be appreciated
Why would a fuck buddy get jealous?
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