God, Shelley, how could you not?
Picture this scenario: One year, he gets in contact with you. He says "Why didn't you ever try to find me?" You respond "Well, I looked you up on Facebook, and I found you, but I decided not to bother you." You did the right thing.
You're his mom, he's your son, and I'm crying like a baby! I can't imagine losing my kids! I am so sorry this happened to you.
I had postpartum depression twice, a drop in the bucket compared to your ordeal.
If he responds, which he will, you have this all written out already as your explanation. He wants to know. This is probably the scenario he's been wishing for.
No child wants their parent to not want them. He will be unburdened to find this is not the case.