Thinking about abandoning pregnant GF...

My GF is pregnant and I was really excited to be a dad when I first got the news. Problem is we went to prenatal screening and found out there is a high risk of Down syndrome. A follow up diagnostic test confirmed the baby has Down syndrome.

I want an abortion because I am not prepared to raise a child with Down syndrome. This is not me bashing Down syndrome people by the way, it’s just not something I’m prepared to do. My GF doesn’t want an abortion though so there’s nothing I can do about that.

At this point I’m considering just ending the relationship. I’d pay whatever I’m required to by law, but otherwise move on with my life. My GF obviously decides whether to take the pregnancy to term, but I feel like I have a right to leave given how immensely different a child with Down syndrome is as far as responsibilities and future grand children.

Anyway, I’m asking for advice about how to break the news to my GF. I obviously have to tell her ASAP so that she can make an informed decision. But I don’t want to come across as manipulative.

I realise I’m coming across like a heartless prick here, but I genuinely care about my GF and want to do this in the best way possible for her emotionally