EMMA.
At the time you made it clear, it was the truth. It would have been unfair if you were dishonest, but you weren't. You're allowed to change your mind, Emma.
Jealousy isn't an emotion anyone wants to have, but what matters is what you do or don't do about it. If you want to tell him you aren't taking the same position anymore, you should, but you need to be prepared for if that doesn't change anything for him.