Start by googling his name. You’d be surprised what you can uncover by a simple search

Look him up on social media

In my dating years I’ve met a few men who claimed to be divorced in their online profiles yet they weren’t. Ask for specific date of his divorce. See what he says

I’d not put much weight on to him being sweet. He wants sex and you are much younger than him so he got to be sweet to get some. Sorry to be skeptical like this but this guy’s story is fishy