But if the unbelieving depart, let him depart. A brother or a sister is not under bondage in such cases: but God has called us to peace.
All Commentaries on 1 Corinthians 7:15 Go To 1 Corinthians 7
Augustine of Hippo
AD 430
A Christian husband may leave his wife without any blame, even if they are lawfully married, if she refuses to live with him because he is a Christian.