We had the same reaction from the officer, but we saw each other 2 times before getting engaged, I suggest try to see each other as much as you can. Don’t give them any other reason for denial. Take photos from your trips if you took some. It’s hard and emotional to go through this process especially after a refusal. Keep your head up.
do try to be at the interview for the spouse visa even if they ask you to wait outside. Good luck