Obviously Paul’s wife was not with him in his missionary jorneys. We don’t know if she was alive, maybe she chose to stay behind, perhaps was not a believer (never converted from Judaism)... What I think Paul is saying here is that, without his wife, he’s abstaining from sexual relations and he recommends those unmarried or widowed to do the same. But I don’t see where he’s suggesting that he was not married.
That's because he did not have a wife.