My DH had a girlfriend. Not proud of it, but that is a different part of my story.
Yes it caused hurt and upset, for which I will always be sorry. I never, ever asked him for anything, or to do anything. I took a chance on him and it worked out. Your story is different, but like me at the time, you have your life and he has his. You are dealing with the consequences of your actions and he must do the same whatever his situation is, that's for him to deal with.
He will no doubt be terrified. Be kind, calm and gentle with him. He will be worried about what he will tell his parents, family, friends, and girlfriend most probably.
I suspect it's too abstract for him at this stage. If he comes to the 12 week scan it may become more real. It could help. The pregnancy is one thing the logistics of his situation are quite another.
Of he persuades you to terminate you will have to live with it, he won't, save for the odd pang of guilt maybe? Your friend won't have to live with it. Only you can decide.
What will most definitely happen, I assure you, is this baby will be loved and they will all get over it.