G'day,
Your SO obviously likes to see you suffer!....putting road tyres on a mountain bike, doesn't make it a 'roadie'!. It will still be heavy, cumbersome, to highly geared, etc, etc to ride for any length of time on the road....even worse if it's got suspension!. If you are planning on doing road rides, you need a 'roadie'. You will find it significantly easier to ride than an MTB on the road.....
cheers,
Hitchy