The Doctor's past finally catches up with her. Yaz faces some horrible truths about the woman she thought she loved. Are her feelings strong enough for her to have the Doctor's back anyway?
The doctor loves Yaz, but she can't let anything happen. She's scared, she knows she will only hurt her in the end. Travelling with the doctor is dangerous enough but being in a relationship with her is ten times worse. So, she pushes her away.