Denny Burk makes the case that St. Paul was a widower :
It is generally agreed that the apostle Paul was an unmarried man for the duration of his ministry. Not only does Acts omit any mention of Paul having a wife, but also Pauls own letters seem to indicate the same. Nevertheless, there is some disagreement over whether or not Paul had been married at an earlier point in his life. In this post, I will argue that Paul was in fact a widower at the time of his writing.
(Via: Justin Taylor )