you have to know that you didn't do anything wrong here. it is great that you were happy for your dad to have new relationships. there are plenty of great step parents out there who are loving and supportive. you unfortunately did not end up with any of them, it seems your dad attracted a certain type of woman. some people don't like to share. some people resent the responsiblilty of caring for antoher persons child. some don't like the competition for dads time. your dad obviously attracted these type of women. it wasn't about you. it was about their personalities and their possessiveness over your father. you were in the way. you had every right to be there. you came first. your dad should have defended you to these women. you may have put his need for happiness over your needs and not told him what you were experiencing. but what you experienced was a common dynamic. do not accept blame whatever you do. take care.