How do I do now with my fiance?

Hi all,

Last night, I has been checking of my fiance email and I was shock when I know that he has another email address with only women names in the contact list.

We know each other from 10 months ago, and been in love for 2 months, get engaged 2 months ago. I am Vietnamese, he is Canadian...

I was really shock when I saw some newest emails he sent to his ex girlfriends at the X-mas ( happened after he start to love me for 2 weeks) with love and passion letters and their old photo to said how pain he is...He still keep all of her email and I can feel that his love for her are so deep and he say the true to me that they destroyed their relationship because his similar problem with ex girlfriend as well

Not only that. I even know that he still contact with many women at a few dating sites with flirts...just before he gave me engaged ring 3 weeks... but his account are hiding since he gave me a ring...

But I can see the last email he sent to a women at 17, match too...

I dont know what to do now, I dont want loose him even I wanted to break this relationship, and I did say that, but I am so in love with him, so I did refused my decided so fast after his appoligize

He is still sweet to me, but I felt that he still want to continue to do that again, that's his drug when seeking women in the dating sites, I think. I am beautiful, attractive and intelligent, tender but I dont know why he still want to have another women? Can I believe his appoligize and forgive him or breaking this? I know that breaking this relationship will destroy my heart, but right now after his appoligize, I still feel so sad, I dont want my life will be bad after marry... Please give me any advice...