Cancelling plane ticket

Long story short, I’ve been FWB with this guy for a while. I live in WA state and he lives in NV. He was going to come and visit me but I’m tired of the FWB label and I really don’t care for this guy like I thought I might. He’s suppose to be here to hangout with me for a week but my family and I are going camping and he doesn’t want to go to that. Along with me graduating from college all my family will be around too and I don’t want to make him uncomfortable especially since he’ll have to meet my family and I don’t want him to since he isn’t my boyfriend. What should I do? How do I tell him not to come in the nicest way possible before it’s too late? He comes to WA in 3 days!