Couple must secure valid marriage license prior to matrimony

Dear PAO,

My friend was dating a married man. She insisted that they get married but the guy consistently refused considering that he is still married to his wife. He promised her that he will work on his annulment. But because she was not satisfied with that promise, she got hold of a purported marriage contract and told him to sign it just to appease her. She assured him that it will just be between the two of them. After a year, their relationship turned sour and the guy eventually left him. She is now considering of filing a case for bigamy. Do you think the case will stand?