I'm going to tattletale on my boyfriend to his mother
Why are you going to tell on your boyfriend?
I think she should know about the bad things he's done.
While your boyfriend may be doing things that you disapprove of, you should handle it yourself. Telling on him to his mother is only going to cause a large rift within your relationship and it is considered a rude act in the first place. Treat your partner like the adult that you are in love with, or leave him if you can only view him as a child.
His mother should what her son is really like. He's not the perfect angel she thinks he is.
I think you should try to find other ways to cope with your boyfriend's actions. Telling his mother could damage their relationship and create a rift between them. He may really resent you for your actions.