<human>: Can you give me the gist of the text in a nutshell?

I've been dating a girl for 5 months and we started using Facebook to chat. Since I have nothing better to do while talking to her, I have scrolled through her wall out of curiosity and boredom.

She speaks a different first language, and hitting the translate button I see her talking about her husband in the past. To me she has always referred to him as her 'ex' and I just took it for granted that it was her boyfriend.

After looking at the language more, this is definitely her ex-husband. They were together for 4 years.

Earlier this girl and I had a fight about 'lies of omission,' I eventually apologized to her because she was just not telling me some bad stuff that nobody tells anyone early in a relationship (and I certainly have my own vault). So I want to be really sensitive treading this area, because I feel like I was wrong before.

At the same time, it seems like kind of a big deal. I should mention I have asked her before why they didn't get married after such a long time, sort of an innocent curiosity, and she never clearly answered the question. 

How would you feel about this reddit? She's young, maybe got married really young, maybe it's no different than any young LTR that ends when people change. Maybe it doesn't change anything practically speaking for me. But it does seem like a big ommission. And I might want to revisit the other ones if the whole ommiting-stuff thing appears more deceitful (the other stuff was mostly one-off embarrassing things I needn't have known about).
<bot>: 95% sure girlfriend was married, I knew she had a long-term relationship that ended last year but she never referred to him as her ex husband. Or boyfriend. Or fiance. Just 'ex.' Is this sketchy?