I need some advice and some hugs

So I met this guy online through a game we played. And we actually met on line the chat app. The chemistry was so good. We couldn't stop talking to each other. I knew he had a girlfriend but exactly one month in, they find out he has knocked up his girlfriend. He begs me not to stop talking to him. And now ten month later he has his kid. And there are complications with the post partum part of the pregnancy and he won't stop talking to me in the free time he has. And I need him to stop. I don't have the heart to block him but he doesn't get that this isn't easy for me and i can't be objective. What do I say or do?