Jacaerys knew he wasn't a good father. He'd been cruel for what he did.

I mean, what child deserved this?

He remembers he'd always hated her. She was bounded to Sunfyre after his uncle's death, an accident because she snuck away while they were visiting Dragonstone. He hadn't felt pride... more disgust because Sunfyre? Really? She'd been clingy and annoying, something he'd never delt with, he reacted badly. It wasn't till he came to the realization that his once clingy daughter wasn't even writing back about how she desperately wanted to come home... anymore, whom they'd sent to Winterfell at just 7 years of age... ten years ago to be Cregan Stark's ward; she'd end up marry to Cregan's oldest son in due time he supposed.

Baela had tried to tell him. Baela had always been better at putting up with it. He just... wished his mother was still here. He felt like he'd woken up one day and started feeling guilty and now that was how he ended up trying to reconcile.