Fanaelialae
Legend
This sounds like two people trying to drive the same vehicle at the same time without even having agreed on a destination.
I agree with the others who've suggested that you each run your own campaign.
If you want to continue to co-DM, you could have the campaigns set in the same world but in geographically distant regions (in which case very large scale events might impact the other campaign for better or worse). Alternately they could be set in parallel universes, in which case you could use the same material but wouldn't be beholden to what happens in the other game.
I agree with the others who've suggested that you each run your own campaign.
If you want to continue to co-DM, you could have the campaigns set in the same world but in geographically distant regions (in which case very large scale events might impact the other campaign for better or worse). Alternately they could be set in parallel universes, in which case you could use the same material but wouldn't be beholden to what happens in the other game.