I suspect they've been separated for quite a while. It's been obvious for ages that something was going on but I think they were just living together for financial reasons. Hasn't he gone to his family for Christmas without her for at least the last 2 years? I know some bloggers always say they prefer to keep their life stuff private but if you're a family/lifestyle blogger and make an income from Instagram and rely on engagement, it's kind of weird to not actually talk about your real life and just pretend everything is fine or avoid the issues. I doubt she will say much but it's quite telling that she hasn't mentioned co-parenting or being on good terms with him for the kids (I.e. the usual stuff people say after divorce!)