Stop beating yourself up for not seeing what you couldn't see before you grew wiser, for not knowing what you didn't know before you learned it, and for not doing what you'd do now with your learned wisdom.
Hindsight is 20/20 but life is a learning process.
Give yourself the gift of forgiveness, develop resilience from this, and know that you can encourage and be there for others before they go through the same, but if they choose to make the same mistakes, it's only because they can't see yet what you couldn't see before, either.
Some life lessons have to be lived through before they can be truly understood.
Get your copy of "Happiness in Your Life: Book Two - Intuition" This book will help you recognize and develop your intuition and how different emotions feel within your body. A practical guide to the sixth sense, this book will make you see the world in a more in-depth way-- from the inside out.