Why my girlfriend asking me weird questions like what if our relationship didn't work?

I have been with this girl almost 3 years on July..
She started to reply me (i don't love u as a joke) i understand its a joke
Then she said it again today.. and laugh.
Thrn after that she ask me a question
What if our relationship doesn't work?
I told her ; is there something Wrong
She replied ! What if
I told her ; ill work hard to make it work..
Note ; she's having hard time with her work.. health stress and family stress and financial stress the moment
What she means by that? Thanks 🙏
Updates
+1 y
she's having the period and financial and work and family stress
Updates
+1 y
she's singing break up songs today
Why my girlfriend asking me weird questions like what if our relationship didn't work?
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