How do I stop a crush?

I am a single male 44. I live in a semi remote area where jobs are far and few between but recently recieved this job offer delivering pizza in a brand new buisness that offers great cash tips to do the job. This is not a carear job but it is a decent income for the area and its working with the best people you could ask for. My friend and boss, hires her sister to work with us after the first week and permanently. I fall head over heels sectretly infatuated with her younger sister of 20 years old. My question is what are the chances that the fact that i have a cursh on this girl has been noticed within our group of only 8 employees without me leading on or telling anyone because i am getting hints that i should date so and so or do this after this impossible crush chose a boyfriend.