Two things: first, you could choose to prioritize the first job whereas firings are unilateral, second, consider yourself in a similar situation making a simila

Two things: first, you could choose to prioritize the first job whereas firings are unilateral, second, consider yourself in a similar situation making a similar choice and then someone describes you leaving as being fired. You would likely feel badmouthed because of the specific connotations that word has. Oh probably worth considering that we can describe the last position you voluntarily left as being fired - you weren't going to show up anymore, so what was going to happen? You got fired but with different paperwork.