Is it normal for your boyfriend to joke about killing you. ?

My boyfriend has an odd way of thinking. Sometimes he jokes about killing me. We both laugh it off. I'm not worried cause I don't think he'll do it. He's schizophrenic and doesn't take medicine. He's quite larger than me. He's 6'2 180 lbs. I'm 5'0 135 lbs. he jokes about everything so it's hard for me to take him seriously.
Is it normal for your boyfriend to joke about killing you. ?
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