Normally I would say ‘so sad … too bad!” You probably blew the potential opportunity.
The interviewer’s initial thought may be “Well, how can I expect you to stick with me if I hire you?”
But then again, they may just say “well here is someone that has the guts to call back.”
You might get another chance at an interview, perhaps not. Definitely not, if you don’t call back.
One way or another you need to deal with the ambivalence you seem to be experiencing over your current job. You need some closure. Don’t be surprised if you are asked to explain your initial declination of the interview, either on your return phone call or during the interview.
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