How do I bring this up? Advice needed!

I've been dating this guy since December and he's an amazing guy, treats me like a queen and I really have no complaints. I feel like he's been very honest with me about everything except one thing. He says he's divorced (I am too so no judgements there) but since I'm nosey I want to know about her. He said it ended because she got into drugs and alcohol really bad and no matter how he tried to help, nothing changed. I'm sure we all know that women can find out more info than the FBI but I can't find ANYTHING about him being divorced. He has mentions of other women on his Facebook from years ago but no mentions of a wife, marriage, divorce or anything. I looked up the public records...nothing! I found his dad's divorce record just by searching last name. Am I crazy for doing this? Should I and if so, how do I bring this up? If it's not true, why on earth would someone lie about being divorced??