Our expert says:
Sounds like he took this relationship really seriously, and she saw it as recreational or as some sort of practice session. She sounds more than confused, and hardly worthy of him. She sonds manipulative and unstable. Forbidding your son from seeing her is likely to drive him into her arms. Rather be calmer and chat to him about it more frequently, reminding him how unkind and thoughtless she was about his feelings last time round, and how there's really no reason to expect anything better this time, and how you don't want him to get hurt again. But maybe he needs to make this sort of mistake and learn from it.
He can refuse to meet her romantically, without needing to climb out of the window any time she comes into the same room at uni.
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