When a friends with benefits gets mad it means that he cares or he’s catching feelings?

I confessed my friends with benefits that my girlfriends dislike him. He got mad, he’s not texting back I really wonder why he’s so offended.
We’ve been seeing each other for months, lately he has been sharing with me very personal details about his life but so far we haven’t had an official date.
Last month he said he doesn’t want a relationship so I’m a little bit confused.
When a friends with benefits gets mad it means that he cares or he’s catching feelings?
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