You should not feel embarrassed or ashamed. The situation is fairly typical these days, alas, and, in your particular case, is exacerbated by the severe mental illness on the part of the ex bf. You need to realize though that you will not be able to stop it completely quietly. However, if you seek support from professional sources rather than private persons in your life, you will have more privacy protection coming from professionals because they have a duty of privacy protection towards you while people around you do not. That is another argument in favor of contacting police/lawyers rather relatives/teachers/friends.