hi @Ken_Walker1, welcome to the forums.
This bike is discussed quite a bit on the forums, searching for the keyword has numerous results. One example: Getting a Schwinn IC4/Bowflex C6 & Power Pedals: I want accuracy
In my opinion you will be happier with a smart trainer that will automatically change the resistance rather than having to manually change it on a spin bike. You might find that once you get into Zwift you do start to care about accuracy and wanting to try racing.
Also, Zwift would require both you and your girlfriend to have paid accounts in order to ride together. Is she already on Zwift or would she need a bike/trainer too?