When we say the things we say...
...that many people don't want to believe, we often don't want them to be right either. The things we are right about are so painful and sad that the last thing we want to do when somebody finds out we kind of knew what we were talking about is say, "I told you so."
The key, now, is to take what you've learned and let it inform real change in your decisions and actions going forward. If you can do that, then you will be on your way to a better life.
More than once I've ignored my own experience and council, or that of others I respect and who I know are right, only to pay the price.
Take care, take what you want, and leave the rest.
Cyranoak