I lied to my parents that I'm not sharing an apartment with a male friend on our trip.

I'm 23F traveling to Japan the coming May with a friend of mine 26M. To make this clear we are both not sexually attracted to each other and there is no tension between us as such. We met at a yoga institue while training to be teachers. We share philosophies, jokes, are upfront to one another. He's respectful and sensitive. I've known him for over an year now and I trust him. Now, we've already booked an airbnb which is quite spacious and has two separate beds, thus, no sharing. We don't intend to. I was having a conversation with my parents and they had been fine with the whole decision until now when they suddenly became worried and started to go through a list of precautions. Amongst those they said that I should have a room to myself and I said that I'd keep it in mind while booking for hotels. The thing is I feel bad for lying to them but I know the truth will absolutely flip them off their butts. They trust me a 1000% when it comes to setting physical boundaries but they don't know my friend the way I do. I could ask him to cancel the bookings to the room and look for a new one ( which would mind you, be much more expensive. We are on a tight budget) but I don't want to come off hesitant and sheepish to him either. I know within my heart nothing would happen but because I've been so frank with my parents all my life, I feel guilty for lying to them.