Thinks I’m cheating but I’m not?

So my hubby came home yesterday and keeps talking about my boyfriend? Everything is why don’t you ask your boyfriend. We have been together 10 years have 3 kids together. I am not nor do I ever plan on cheating on him. Life’s busy we both work and raise the kids. They all do sports that require hours at the arena weekly . I don’t know when he thinks I even have time to cheat. I keep telling him I’m not and he says, I can tell your lying? My concern is a friend of his from his teenage years is recently single. Due to her hubby cheating. He’s always been very open with me about how he was friend zoned by her. They have kept in contact not a daily or weekly thing maybe about 10 times a year? Right before her break up my hubby did some work at their house. ( he owns his own business) so they have been in contact a bit more. Should I be worried he’s trying to cover something up by blaming me?