Is my boyfriend’s “crazy girlfriend” joke a relationship red flag?

I asked my boyfriend "how does it feel to have a girl so crazy about you?"

he replied: "happy but a little scared"

I asked "why?"

He said: "because if I were to break up with her, she would do crazy things like try to kill me"

There was suddenly an awkward silence.

I managed to awkwardly mutter "I would never be crazy enough to do something like that"

he replied: "lol I'm just teasing"

I can't exactly put my finger on why but this just left a really bad taste in my mouth. I just got the "ick!" He swears he loves and cares for me. But after what he said, I felt unsafe loving him. This is pretty much proof that I love him more than he loves me.

Is my boyfriend’s “crazy girlfriend” joke a relationship red flag?
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