I have always been considered the big or little brother to many of my female friends and we have great relationships. With my current gf we fight over the stupid stuff.
I just get along and relate to women better than men. Its my listening skills, i guess. I later found out that most of my female friends secretly had more than friendship feelings but never persued because the didn’t want to ruin our great friendship.
It possible your female friends may have something secretly for you but know you have a gf.