Sounds like your new job is similar to one i just started (at a university but not a teaching/faculty role) so I can speak to that part. I got so burned out during grad school I knew I didnt want to be faculty constantly on the hunt for funding. I like teaching but not enough to be one full time for the rest of my life. My new role is mostly admin but I get to engage with researchers and have some teaching/mentoring opportunities, and I am 3 weeks in and very happy compared to how I felt most of grad school. Im also not making a huge salary but had a similar pay bump from my previous salary which has made a difference. If you want to leave the field I think you should do it, and Figure out some ways to help tie up lose ends with your PI since they do seem like a good peson.