Upvote:1
Yes, you should say that.
It is good idea to be honest when you're passing the interview. Your other alternative is lying or hiding the information - but the consular officers are trained to spot lies or digging out the suppressed information. And being caught in this might have far worse consequences than being rejected again.
However I also suggest to spend more time to prepare your case better, especially considering your past rejection. To qualify for the B1/2 visa you need to overcome the presumption of immigration intent. If your fiance is working in the US - as stated in comment it is a bit unclear - visiting her would actually contribute to the presumption of immigration intent, making your burden greater. Neither bank balance for the trip nor a stable job guarantees your return, so you need to bring more evidence which would overcome the presumption that you'd remain in USA.