This is something wrong that HE did, not you. Face to face let him know that you will not feel guilty because you did nothing wrong. Let him know the family doesn't have to know but that you want nothing to do with him. Be strong and take back the power of your mind. Be positive that YOU will be fine and take back YOUR power. If you dwell on it then he keeps power over your mind and emotions.
From my experience, you can move in and out of the different stages of engagement and effacement as the baby is making it's way down the birth canal. They burrow and twist and turn - sometimes not until full on active labour - Don't worry it won't be too much longer!!!