...Because she was following her heart, not her head.

[That gets conveyed with some bitter annoyance. He doesn't mean to, but he's never been very good at hiding his emotions, especially not over communion. And this newcomer's question is just... Well, the answer should be obvious if you take emotion into account, shouldn't it?

His smouldering temper cools off a few degrees with some effort, before he adds:]

If you're asking for a more specific explanation than that... I can tell you my own theories, based on my interactions with her.