why a crush is called a crush

i have crush on one of my best friends (i’m a girl , she’s a girl) and for the longest time i thought she was gay , until recently she would start talking more about how much she likes guys or how she’s “strictly dickly” etc . not sure what to do because if i tell her i like her i either get a gf out of it or i lose someone close to me (and probably my other friends because they would think i like them too) or if i don’t im stuck with a crush i have to see and hug and talk to them everyday but just as a friend . whatever