Why did he do this?

My friends with benefits and I were texting and we were planning on meeting up. He was asking me to send him nudes and he said he’s practically my boyfriend now. I said thats not true and laughed. He said because I only crave him. I made a little joke along the lines of who said I’m only having sex with you lol. He got very upset. He started saying how I should just go f@@@ them then and still is giving me the cold shoulder a day later. Why? We’re not dating and I thought this was a casual understanding. This is my first friends with benefits so maybe this is normal and I don’t know? Please let me know. Thanks!
Why did he do this?
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