<human>: Can you succinctly summarize the text in 1-3 sentences?

Dirtbag ripped off my terminally-ill father a year ago, and while my dad was venting to me about all the bad things in his head, he ended up telling me today.  Now I know this kid, he's a little 19 year old  who was friends with my brother originally.    

Anyway, my father told me to forget about it but it made my blood boil that all my dad does is give to people and all they do is take from him.  The kid tricked my dad into lending him $120 bucks by saying that his family is starving. My father later found out he used it to buy rave tickets and when my dad confronted him, he just started ignoring my father.  My blood is boiling, but I tried to be reasonable and messaged him kindly asking for the money back, but he ignored me too!  Should I just let this go?  I feel so angry. I also found out the kid has a good job and lives in a nice house, which makes me even angrier.  Reddit! Help me!!!  He may or may not have ties to  meth-using gangster family members.
<bot>: some kid ripped off my cancer-stricken dad my dad wants me to let it go. what would you do?