Would it be a mistake for women have a second child with a man she does not love?

Would it be a mistake for women have a second child with a man she does not love? She has one daughter with him that is unplanned. She says that she is very lucky that he is a very good father and can trust him 100 percent. She gave him 50/50 custody both parents are very comparative and the child has a very stable home. He wants a second child.