See, I don't get that vibe about Ioan Gruffud's at all. They've been separated for quite a while. Some of the stuff she's been posting on social media is very nasty. She's admitted to screaming at Ioan Gruffud's when he's been on face time with his daughters, refused to let him have access time with them, been incredibly derogatory about people - referring to IG's girlfriend as a 'ho' 
, and his mother as a 'narc' and using her children as an emotional crutch.
And, of course, we only have her version of events (which have changed several times). She has been deleting things she said on social media.
There are certainly many men in the media spotlight who haven't behaved well - discarding long term partners with whom they have families, for much younger women. And yes, women should be able to be open about their sense of loss and betrayal. But what Alice Evans is doing is off the scale. It will be harming her children, she is harming their relationship with their father and probably with herself. IG is allowed to leave his wife. Perhaps the photo of him with a new girlfriend was posted because the press had got hold of the story.
AE is controlling the narrative to a certain extent, portraying herself as the wronged party, but she is burning bridges all over the place, and ultimately, she will be the one who suffers the most from her behaviour.