Can my fiancé adopt my son?

Question

Look. Long story short (hopefully I hit all the right points and give you the info needed....if I don't, I'll reply by editing at the bottom of the post!)
So baby daddy was a whirlwind 2 month romance where we weren't a dating couple but ended up being unwise and got pregnant. He wanted nothing to do with him or me until he turned about 1. Where he offered to get things that he needed (like diapers) which he never did. Or crib sheets which he never did. So when I needed a car seat and went and bought it by myself he was mad because I didn't tell him because he would have liked to get it for him...even though he can't keep his word and buy diapers or clothes I'm supposed to assume he will follow through with a carseat?! Nope. 
Anyways. Baby daddy was too busy with his world and his life. Like his work, women, which is fine. Just he made time for everyone else and it was clear on things like social media or even the things he said. Like one day he would miss our son, I would say ok come see him sometime and I'd say how about this day and I'd get oh no I have work or my girl this or this girl that. Always excuses and half the time he would forget to reply apparently and just not show up. He was also the same guy who would post stuff about missing his kid and being a good dad like he was involved.
I moved on of course. Again we were never dating.
My fiancé and I met a year ago just as covid hit I guess. When you know you know and we just got engaged and he's made it clear that he would love to adopt our son - he considers him his son. Like went out and bought him a carseat for his car, sold his Camero for a pick up so he could fit the kiddos gear. They are best friends. He's an amazing dad. He sees him as his son.
Now. Adopting. How would that work?
Baby daddy isn't on the birth certificate, has never paid child support, is all talk and no walk. So I'm wondering how this may go? Do I need his permission?? Have you gone through this before? Tell me your story

Answer

I believe the child’s biological father still needs to sign over rights. If he doesn’t care, then it’ll be a super easy process. I was adopted by my stepdad. It was pretty easy

Answer

Take him to court for a child support, he may come around at one point but I believe you need to take him to court regardless. For child support or have him sign over rights.

Answer

The court wouldn’t allow it because you have only been with him for a year, some places it’s a min 3 years. If the real dad isn’t on the birth certificate and doesn’t pay child support you do not need his permission. And also your child has to be at the age where they can say that’s what they want

Answer

1. I personally think you need to know your fiance much longer before involving him in the legalities of your child. You need to see him deeply to make sure he is a good stable person and these things take time. There are so many women who relationships dont work out and imagine if your fiance becomes an ex and still has legal rights to your son. You iust really need to truly spend life and examine this man thoroughly before making a huge move. This literally would mean if u die... your finance would be responsible and get your son.

Answer

not sure how the process goes but it is possible. i work at a school and one of my students was adopted by his moms husband. he is on his birth certificate and everything.