Nick wondering if he’s still the kind of person Juliette would fall in love with makes me sad, but it’s also an interesting point.
I mean…you’ll forgive someone change when you love them, sometimes. Juliette adjusted to Nick’s life as a grimm eventually because she already loved him, had loved him for years.
But would she ever have knowingly chosen to START a relationship with a grimm? Given her often-expressed doubts and discomfort with the life…I kinda doubt it.