I was thinking the same thing. There's always more to the story, especially when a woman is telling it. That's why a dude should never try to take up for a woman before he gets every inch of the story from multiple angles. Because women have dudes going to war over some "he beat me up" tip only to find out that she was engaging in some very foul play. Now, he's at war with a dude over some omissions.
Something tells me that her dude's flirting/cheating allegations weren't totally baseless. She's a typical attention whore...posting pictures all over social media, flirting with dudes on public sites, shouting out different dudes, etc. She knew this got under her dude's skin, but she did it anyway because that's what she's about. This kept adding up and up until dude finally began to confront her about it, which she didn't take serious.
One thing that black women who date white guys have to keep in mind is that those types of white guys tend to be very sensitive about their woman interacting with black men. They know that she's probably been with black guys before, probably slept with them before and probably loved one or two before. Plus, they tend to feel that the black dudes have a one-up on them in their woman's eyes because they're black. This can make the situation extra tenuous when the chick is flirting with black men.
Something tells me this dynamic came into play.
Peace