I know that St Cyril of Jerusalem, among other early Church Fathers, believed that St Paul was a widower. However, there is really no unanimous position on that matter from the Church Fathers.
Let those also who marry but once not reprobate those who have consented to a second marriage : for though continence is a noble and admirable thing, yet it is also permissible to enter upon a second marriage, that the weak may not fall into fornication. For it is good for them, says the Apostle, if they abide even as I. But if they have not continency, let them marry: for it is better to marry than to burn. But let all the other practices be banished afar, fornication, adultery, and every kind of licentiousness: and let the body be kept pure for the Lord, that the Lord also may have respect unto the body. And let the body be nourished with food, that it may live, and serve without hindrance; not, however, that it may be given up to luxuries.
Clement, indeed, whose words we have just quoted, after the above-mentioned facts gives a statement, on account of those who rejected marriage, of the apostles that had wives. “Or will they,” says he, “reject even the apostles? For Peter and Philip begat children; and Philip also gave his daughters in marriage. And Paul does not hesitate, in one of his epistles, to greet his wife, whom he did not take about with him, that he might not be inconvenienced in his ministry.”