If your first love died many yrs ago how can you meet someone that acts the same as her but resembles another?

I have meet a girl that resembles my first girl I loved at 14 yrs old I am 40 now an this girl makes me feel like I am with my first love by felling inside but resembles my ex wife .we have had a good friend ship for about three months . but now she dont even call me anymore.Ilike what I have felt being around her but hurts to relive the past.