Workplace Boundary Test Fail

I’ve been working as an ICU nurse for about five years now. I’m in my 30s and have always had a strong work ethic, focusing on building professional relationships with colleagues and patients alike. The hospital where I work is like a second home to me; every day feels like a new challenge that needs to be met head-on. One of the nurses here, let’s call her Sarah, has been in my department for about three years. We’ve never really interacted much personally until recently. She’s young, early twenties, and quite beautiful, if I may say so myself. It’s not like she goes out of her way to draw attention; rather, it's the subtle confidence that makes you notice. Over the last few weeks, Sarah has been asking me for advice on patient care and management more frequently. She respects my experience and seems eager to learn. On one shift when we were both off-duty, I had a brief chat with her about career aspirations outside of our hospital. We ended up talking about our personal lives as well. Things took an unexpected turn at the end of that conversation. Sarah hinted she might be interested in more than just professional development from me, dropping some suggestive lines without ever being overtly clear. She has a way of saying things indirectly which makes it hard to gauge her intentions but impossible to ignore them completely. Since then, I’ve been struggling with how far to take this boundary-testing behavior. We both know our roles and the boundaries between personal lives and work are supposed to be strictly maintained for good reasons. Yet there’s something about Sarah that challenges my usual detachment. I’m writing this just to get some of these thoughts out, maybe thinking it through will help me decide how to handle things without compromising my professionalism or crossing any lines.