GA stepparent adoption. Experience? Tips?

My son's sperm donor has never really been a part of his life I've been married since 2017 my son is now five going on six and we've wanted to start the adoption process for some years and now we're finally ready to do it financially. his sperm donor is doing his normal routine now where he pops up Acts interested in then disappears again. We haven't heard from him since the summer of 2018. We know that legally we have to notify him as soon as we file for adoption which is fine I'm just wondering if since now he's messaging my friends now and making it seem once again as though he wants to be involved will it destroy our adoption case. he's never been around for my son he's seen my son a handful of times in his entire life my son is now going on six and has no clue who he is he only knows my husband as his dad. We've been together since he was a year old. He's also not on his birth certificate. For a period of time he denied being the father of my son even though he knew full well that he was his biological father. His mother bought one of those DNA tests from Walgreens and sent it into the lab but there has never been any court ordered DNA test or anything legally that ties them to my son. He also has not contributed financially mentally or in any way to the upbringing of my son. with him starting his act up again and reaching out to people will that destroy my adoption case in the state of Georgia? Any tips or advice or any other parents who have gone through the similar situations? He's reached out to friends but not me personally he tried to video call my husband on Facebook but we didn't know until today the call was a few days ago(my husband never gets on Facebook). we know now that he's reaching out but will it make us look bad in court because we are ignoring him. We are ignoring him because this is what he does he acts interested and then disappears or acts interested and things don't go his way and then disappears.