You sound like an egotistical philanthrop and narcissist. It is plain as day in your writing. You are not really concerned about this person for altruistic reasons only about how it makes you feel when you help them and how you can control them.

Once they rejected your advise, you rejected them. True friends, don't try to control people or force their ideas on people. A real friend is capable of maintaining a friendship by respecting the other person's opinions and supporting their decisions even when they don't agree with them.

One of two possibilities, you were being scammed by someone you didn't really know at all. Or you never respected your "friend" as a person with a life of their own. You assumed they wanted or needed your help.