Well I would hope he thought she was a good person if he was taking her into his life to care for his child.
I feel certain he did believe and think she was a good person..I sincerely doubt he would intentionally bring someone into his life or his child's life if he thought they were capable of doing harm to himself or to his child, however just because we hope, think and believe a person to be good, doesn't necesarily make it so...Who knows what evil lurks in the hearts of men..until after the fact....JMO