From what’s been said, the school, her parents and the police were already involved in looking at their ‘relationship’ before they did a runner – presumably they ran to avoid the consequences.
He’s a massive idiot, regardless of her willingness he was in a position of responsibility. A good few of my school mates had boyfriends in their mid-20s to early-30s when they 14/15 – I thought it was creepy then, find it even creepier now.
He’s completely ruined his life, certainly his career and I imagine marriage, and might end up on the sex offenders register. She’ll probably manage to come out of this with probably just a vague sense of embarrassment and regret, but will be able to move on fairly easily.