My girlfriend lied to me about her age...need help

EvilTurkey
We have been dating for the past year and a half and we have been very happy. We met around the time of her 18th birthday and I had been 18 for about 5 months. We grew close instantly. She has met some of my closest family members and dearest friends and all seemed to love her and embrace her. Things were going fantastic and the other night as we were taking a stroll through the park she stopped and burst into tears. I pressed to see what was wrong and she revealed to me that she was 15. I was shocked and furious and sad. I stood frozen and had no idea what to say. What should I do? Just run away as far as I can and ditch the person who I grew to love and embrace into my life? Or rough it out for two year in secrecy or what?
My girlfriend lied to me about her age...need help
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