Hugs! Feels like I'm looking into a mirror; have had many a conversation like this myself. You are NOT a fool. I think the desire to fix things and expect that things will be different keeps us trying over again with them. Each time we have a fleeting hope that they will finally have realized and then when they don't we only find ourselves hurting all over again. It is okay though. Do not beat yourself up about it especially when the desire to protect your daughters was also an important factor in this.