forgot the unhappiness, Instead, you are a great mom to let Collin have a very good development and growth.
I believe when Collin grows up, when he knows what happened in the past, he would appreciate the loves from parents.
also, you should enjoy now very much, have a small daugther + collin, and Your hubby is so 稱職 to play with Collin in every party.
fully understand your feeling. so that I told you to forget it, forgetting it does not means that you never think abou this again, but you have to more positively face the every difficulty in future.
your story make you now more brave, and you can use this lesson to educate Collin how to face with difficulty in future.
Also, since you have experienced those unhappiness, you should be graceful now what you are receiving.