Why my co-workers started to act differently when they heard I found new job?

I have been working as a nurse in hospital unit that treated mostly elderly people that had suffered stroke. I used to work in university hospital and I’m skillss nurse. I came to this unit because I needed a job that was less hectic and stressful since I was also studying on the side. I always knew I would be leaving soon when I would complete my studies.

after 1,5yrs I found a job that was more clean (office type) job and better hours. When my co-workers heard some of them started to make comments like ” at least you don’t have to do this anymore” or ” your new job will be different”. Their demeanor changed. They asked a lot of questions about my new job. They also were pissed that I didn’t tell them before I left my notice.

Why my co-workers started to act differently when they heard I found new job?
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