in love w my best friend😬

i really need help. over the past 4 months or so i realized i am completely in love with my best friend. however, she has a girlfriend. i didn’t even know i liked girls until now so i guess that’s weird too but anyways. i seriously don’t know what to do. i probably won’t tell her, but how do i get over this? and to make it worse she always talks about her gf and the things they do and i’m happy for her but it’s hard?? i’m so confused PLEASE GIVE ME ADVICE IM SO DESPERATE