I had a few different questions asked of me coming out of this sermon so here are a couple of links to explore a little further.
LINK: Was the Apostle Paul Married? - This is a discussion board, not an article or website that I will trust everything that is said so read it knowing it is a discussion board. However it gives you a good view of multiple sides to that question. I can give you other "hard" resources but I felt this was the best to give you a quick overview on the question of Paul's possible marriage / singleness.
https://carm.org/does-1-cor-7-say-we-should-not-get-married - According to 1 Corinthians 7 you might feel that it is almost a command that people try to remain single, although Paul himself says that it is his opinion or judgement. This article points out how this passage is also a response to the current situation of those who received the letter. To back this up, you can see in 1 Timothy 5 where Paul suggests younger widows do get remarried because they were dealing with a different problem in Ephesus.