Why would my boyfriend ask my to be pessimistic?

bubblespopcorn
I am a positive person and last night when I was on the phone with the boyfriend he asked me to be pessimistic he wanted to he both sides of me the good and bad. I am honestly positive mentally too so I tried hard to be pessimistic. He thanks me but I don’t understand why? What’s the logic behind it
Why would my boyfriend ask my to be pessimistic?
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