To forgive, but never forget.

So I found out recently that someone who once was my best friend in the world, is pregnant.  We are no longer friends.  It's sad that she's going through this without me, but I can't let go of the past.  I have lost 2 of my most favorite girls in the last 2 years.  They both are newly weds, and it's a high possibility that both might even be pregnant.  So what do I do ?  Do I forgive?  Forgiving is the easy part. It's the forgetting I just can't get a grip of.