Guilt about leaving a job

A job opportunity fell into my lap that happens to be in my dream career field and I feel awful because I just got a new job working with kids, the staff is constantly short staffed, someone just quit, and leaving them at this time makes me feel bad the new job would probably pay more and I know I should go for it but how do I tell my boss I am putting in my two weeks in a kind and remorseful way hahahah…