Welcome to the forum. First, well done for giving your thread a very good title!
I have a few pieces of advice for your future posts:
- Please don't post in capitals. On the internet, that is like shouting.
- Remember to capitalise proper nouns (Spanish, English).
The answer to your question is that you will hear both. However, I prefer to say "I am/was sorry to hear about what happened to you". Some people will say that "I am sorry for" means that you are taking responsibility for what happened and are personally apologising. It can mean that but I don't think it always means that.