I accepted a pre-doctoral fellowship at University A with the expectation I will pursue a PhD there. After 3 months into the fellowship, I realized that the program doesn't exactly spark my interest and I cannot see myself spending the next 4-5 years doing this type of research.
Unfortunately, it's hard to bring it up with my current potential advisors since my background is a perfect fit for this topic. A professor at another university B reached out for an interview and if I am successful with my application there, I would be more inclined to go to University B as I believe it is a better fit and the research topic there would be much more interesting.
Am I misleading my current advisors by continuing my fellowship at A? Note that at this point, I have not received an offer yet at B, and I'm afraid to leave A in case B doesn't push through. On the other hand, PhD is a major commitment, and I'm afraid I might have ended up committing to a PhD that I'm not all that interested in. What are the ethics of staying at fellowship A?