The way she sat on him was hilarious, not every girl has grace and elegance all the time - being awkward is still very common
But yeah I'm not saying she did nothing wrong, but I don't have any sympathy for a guy who says one thing and suddenly changes his mind within 1 day, then talks about you behind your back constantly, while lying to everyone about his intentions and what he wants.
He admitted that he wanted to string Yewande on without ever being honest about how he felt about Arabella to her - meanwhile talking badly about Yewande every time he was with Arabella. Even after that Yewande didn't react badly or stop him from pursuing Arabella.
That's incredibly childish immature and a feckboy move. I'm glad Yewande called him out on it and stood up for herself.
Any reaction she gave would've made her look bad to anyone who didn't like her already.