I like him but not his job?

I like this guy. We have talked a lot. I like him but not his job. He has a degree in engineering but does not work in the field. He works as a cashier at a store! He lives with his mom. He is 29 years old. I am working as an engineer and have my own place. This guy is really nice but I am not sure. Can I ask him why he don't work within his field? Is it wrong of me to like ask why?
I like him but not his job?
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