Japanese gals suprise me

Met this cute Japanese gal in a cafe, started with a smile and quickly landed up with a good chat about work and travels and she invited me for a drink nearby Chiba district closer to train station. Next thing she mention is she's married 😅 so I was lil hesitant.. as I was thinking she would be single all this while. Is it common in Japan to be so friendly and flirt for girls even if they have partner