Op I can give you perspective from the other side of this dilemma.
I had DS early twenties as the result of a very short relationship. I didn’t really like his father and we were in no way compatible, but it was a fun fling.
When I found out I was pregnant he was at first very willing to be involved, but he was young and in college and I could tell from our conversations that he was really terrified and not ready to be a parent. I on the other hand had medical problems at an early age and had been told I may never be able to have children, so I was ecstatic to become a mum and looking forward to it.
When the time came and DS was born his father kept making excuses for why he couldn’t get to the hospital or to my house. The truth is he wasn’t ready.
It’s my opinion that in getting pregnant I had a choice to continue and become a parent, or take the alternative option and abort. I chose to be a parent. I felt that the father had the exact same right to make a choice too, and told him this several times.
Since DS was born he has never met his father. We still live in the same town, and I know of him through mutual friends. He finished college as planned, in the intervening 14 years he has also got engaged and had two children. He has never got in touch to meet ds, and I will never force contact either.
As far as I’m concerned, a dad who has to be forced to have contact is going to make a pretty shit dad.
Ds has asked about his father in the past, I have never been spiteful and have always explained that being a parent is tough and his father just wasn’t ready. I have told him that when he is 18 I will give him his dad’s name and if he wants to get in touch to see if they can forge a relationship as friends rather than parent and child, he can do so.
For many years DS has seemed interested in this, but as he gets older he tends to say why would I bother to contact him when he hasn’t bothered with me?
From my perspective, there is no resentment to the father as I am happy with my lot with DS. I also have no resentment or negative feelings toward his partner, or the younger children that he does look after.
Sometimes in life we have to make difficult choices, and I actually respect him for walking away from DS cleanly rather than being a shitty disinterested parent claiming to be “forced” into it.
Not sure if that helps you or not, just a different perspective on your position.