10 years ago, I had a daughter that I did not know about?

I was in a relationship 10 years ago, and we were tiring to conceive a child. I was never clear on why she broke it up with me, but she ended it. I did not fight back or anything, if you truly love them let them go. So I did. Recently it came to my attention that 8 months after it ended she had a daughter.

I had moved on and have children of my own. I love them with all my heart and soul, but I find myself with the fact that my first born is really maybe my second.

I don’t know how to feel about this. I long to know if she is my daughter or if she was cheating on me… I doubt she did, we had something really good, I may never truly know. She post pictures of her now on Facebook, but does not replay at all when I send her messages wanting to know more, but I know she is a good person. Really confused about everything…

My Answer is to confirm DNA wise we are related, and then if so establish a relationship. She’ll have my love from the start; the rest is getting back years I will never be able to.

My family and friends say let it go…

Which would you do? and why