I agree with Bob. If one of you wants to do most of the training, that's fine. But I would encourage both of you to attend classes together, so everyone in the household is on the same page with regards to what's being trained and how. Consistency is very important, so if you're doing most of the training you still want your fiance reinforcing the same rules and using the same commands that you are, so your puppy won't be confused.
Forever would have been too short
NAFA: FM, MBDCh-S