Boyfriend talks too much while I’m driving using GPS

Olivia

How can I politely ask him to not talk so much? He always says it’s not his fault but it is, he tries to tell me to look at buildings we pass on the highway or bridges and distracts me from hearing what Siri says. He gets offended and thinks I’m being mean when I tell him he’s talking too much but I need to know where I’m going. He does this every time we’re in the car together.