My dad saw my hickey on my neck. He seemed angry but didn't say anything. Why did he get angry I don't understand?

Anonymous
I'm 21 years old; old enough to make my own decisions. If my boyfriend gave me a hickey that means I wanted it. My dad asked me what's that on my neck and I said I hit it somewhere. He seemed angry but didn't talk just went but he seemed angry whilst eating. Why was his reaction like this?
My dad saw my hickey on my neck. He seemed angry but didn't say anything. Why did he get angry I don't understand?
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