25m advice needed.

A girl in my office and I have known each other for 4 months. Initially, we only talked about work and had some casual chit-chat. Over time, I started developing feelings for her, and I tried to hint at it indirectly, but she didn't seem interested. One day, I asked her to go out, but she said she was busy. After that, I didn’t ask her again. Then, a month later, I directly told her over chat that I had started liking her. She replied that she didn’t feel the same way about me.and cant take any chamce at workplace. Since then, I’ve been feeling tense and unsure about what to do. Currently, we talk casually, but I’m confused. As i am already switching job so Should I give it one last try and ask her again? Or should i stop chasing her....I don’t want to regret not trying 100% for someone I liked