Answer:
1. Listen with acceptance, withoud many comments and adding your story (eg. Oh yes, I also had a hard time when...).
2. Show empathy, by seing "I can feel you", "I imagine this was hard"/
3. Check (ask) if he or she needs some help, if you can help with anything in this situation, eg. find specialist, go to the police, depends on situation.
4. If you feel like, say that you are there to listen, if he/she wants.