Made a mistake

Approached a quiet girl a week ago for work related reasons. (Had to help her stow her isles). Anyway, since then she has been approaching me back to talk with me I don’t mind that but what shes telling me is getting deeper by the day. ( She started trauma dumping on me). Today she confessed that she was lonely and I was the only person she looked forward to seeing at work. Well, I don’t want to be seen with her anymore. I like someone else and her being around me is going to hurt my chances with my other crush….. Don’t know what to do!