Am a wrong for...

Wanting to get rid of my Fiance's best friend!!  His best friend will probably live the rest of his life NEVER doing anything with his life. He can't keep a job for more than a few weeks, does drugs, has no education, drinks none stop, and JUST finally got his first car at 27 years old. He's a TERRIBLE influence on my Fiancé. On top of that he has a girlfriend that lives with her baby daddy (drama!), and they have a four year old that cusses more than I do AND they allow it. I have a four year old and I really don't want that around me and my son. They have been friends for 10 years but I really feel like he's weighing my fiancé down in life. Plus he owes my Fiancé $500 from when my Fiancé had to pay his bail THREE years ago. I haven't brought this up to him yet but I want to know what you ladies think!? What would you do?