Answer:
Your friend is probably the therapist friend. Imagine if you were in their shoes. All your friends ask you for advice and never get a break. Just tell your friend that you understand. If you're sorry, tell them that you regret not being there for them when they needed it and not realizing sooner that they were tired from having to be everyone's go-to. You probably didn't do this on purpose but you should just tell your friend that they can always talk to you when they need some advice as well.