telling my other half that I need to buy another guitar may also not be the best idea.
Any thoughts (or a direction to posting this query elsewhere) would be greatly welcomed.
Find a more understanding other half?
Alternatively the best way to deal with these 'misunderstandings', I find, is to have lots of guitars so that your other half can't tell which is which and fails to notice when you acquire a new one
Back to your actual question though regarding the suitability of using your guitar to learn classical, I guess it depends on what your aspirations are. It will be fine if you are just dabbling & want to learn a few party pieces, but if you are serious about classical guitar it may hold you back in the long run.
Your guitar has a narrow neck & fretboard (48mm at nut), a bridge string spacing of 52mm, a narrow body, a curved fretboard and a 14 fret neck> body join. All of these are non-standard when it comes to a standard factory classical and so if you get used to playing on yours then want to trade up later to a proper classical then you might suddenly find things awkward due to the wider neck fretboard and everything else.
More important though is the affect on your learning and the sound you get.
Your guitar has some ' instant comfort' advantages of course - like higher fret access, that curved fretboard will be nice for barres (and as I'm sure someone might point out, some experienced players actually commission guitars from luthiers that incorporate one or more of the features mentioned. However, this muddies the waters for a beginner IMO).
Unless you have very small hands, a narrow fretboard & string spacing at both nut and bridge can be very restrictive for the technique of both hands (your bridge especially - its about 6-8mm narrower, that's huge) which could affect the development of good technique (eg powerful slurs and a deep free stroke). Finally, your guitar was designed mainly to be plugged in, and the acoustic response (tone, volume, projection) you get will be far less satisfying than a proper classical as your technique develops, it might even affect your desire to take things things further.