Caught boyfriend lying..

I texted him at 12 and he didn't reply till 3, he's like,"holy shizz I fell asleep! There's no way I'm sleeping tonight boo" 
I'm just like... 🙄 I know you were on YouTube the entire time. 
*We share a YouTube account*
So while I was watching videos, as was he... and he wasn't reply to my text message at all, yet the video was more important.  
I sent him a reply, "you were on youtube lol"
He's like," I was on it a little before I fell asleep" 
Nope, hunny you were awake the entire time. I hate being lied to... It's just a text message I know but don't lie to me when I know you're lying. It's ugly. Why would he do that?