What did my friends with benefits mean?

so I was texting him and suddenly just stopped. Acting like a complete dick. So finally we made up. He then tells me, "I'm sorry for being a dick to you. You're just really cool, and this is just supposed to be sex so I don't wanna get attached" I just told him we both know what this is. Then he asked me what it was, and I responded we've already had this convo. What's understood doesn't need to be explained. So wtf is his prob what does he mean by "attached".
What did my friends with benefits mean?
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