I don't want to get back with my ex-girlfriend and raise the baby together because she is pregnant
Was she unfaithful? Does that have anything to do with it?
No. In fact I don't want her anymore.
You don't have to get back together with your ex, but if it's your child, you should take responsibility for your child.
You are getting on my nerves. I'm not getting a single say on my child.
If you want a say on your child, you should be a part of your ex's life and take responsibility for the child, even if you don't want to be with your ex.