<human>: Give me the gist of the text in a nutshell

I found out today that my oldest child's bio father is fighting our step parent adoption. There are a lot of facts so bare with me and thank you for reading. I've been crying all day about this.

-He abandoned my child at 5 months old. No contact, no support, etc. My son turned 6 in May.

- He lives out of state and it took us a couple of months to find him because he was off the grid. Probably hiding because of court ordered child support

-I am married, been with the man since my son was 2 1/2, we were friends and co workers before so he knew my son since a month after his bio dad left (started a job after he left us). 

- I have sole custody. It states in our custody paperwork  (he did a no call no show to our custody hearing) that I have the choice for visitation. As in, it's my call to let him in my son's life.

-I had a protection from abuse order against him. He threw a controller at me and almost hit my son. He also had said and done some stuff to me in the past.

-He's owed child support since March of 2012 and has paid $0. 

-My husband and I have taken care of him, always. Daycare, doctor/dental visits, t ball, you name it. 

-I haven't changed my phone number since before the initial court hearing in 2012. I've had the same number since January of 2012. Same email since 2008. So not getting in contact shouldn't have been an excuse. 

There might be other details. Can anyone help me ease my mind about what is to come? Does it look good for us? The last time I have heard from this guy was before our trial in 2012 when he told my lawyer he would be there. I'm so scared and worried. 

I know my custody arrangement won't change, but I want my husband to be able to officially adopt him. My son knows him as dad and calls him such. Any anecdotal stories or websites would be amazing.
<bot>: My son's bio dad treats my son like his property and is trying to fight against my husband adopting him w/o seeing him for almost 6 years.