My boyfriend is mad at me?

So today I was just thinking about my boyfriend and if he wanted to leave me I wanted him to know I’m ok with it. So I texted him that if he ever wanted to break up with me that I’m fine with that. And he immediately called me and was pretty pissed off that I texted him that. I didn’t mean any harm I just wanted him to feel comfortable. What did I do wrong and why is he mad at me? I’m so confused and was just trying to consider his feelings
My boyfriend is mad at me?
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