I think my friend's boyfriend is a complete liar...?

Okay my friend Natasha has a boyfriend of 2 months named Chris. Chris claims that when he lived in New York (about 3 years ago) he was in a gang called 3 Ne. He said he stole $10,000 from them and gave it to a family member who put it in their parents bank account after his parents have been working overtime. (Apparently they didn't notice their account had an extra $10,000...) Now, 3 Ne is looking for Chris. Chris claims he has a gun and has shot 4 people in this 'gang'. My friend believes this, but I don't. This kid is going into 9th grade and Natasha is going into 10th. How do I bring up that I think this whole gang thing is complete bull?