She is not the bride

A friend of mine, she is still a teenager. Couple months ago, she falling in love with a guy. And his caring and loving her makes her thinks that he is the ONE. They are so happily in love. Last week, what happen was the guy told her, my ex-gf pregnant!!!!! I don't know what should i do. I'm loving you but i got to be responsible for that. He gave her the option: broke up or having an affair with him. The girl choose to broke up. To me, there is NO right and wrong. Just the matter of time. I sincerely wishing her all the best and stand up once again for yourself.