Am I wrong? ( sorry it's long)

My bf's truck has a Bluetooth thing and so last time I got on it said "Yaya" so that girl was obviously in his truck and my name on his thing is "Princess" and it had been taken off.. Well I asked him who was yaya and he said he didn't know who it was.. I had a really bad feeling and so I let the days pass and so I couldn't leave it alone and so I did some investigation and turns out "Yaya" is this girl that I absolutely HATE. I also found out that he has her under "Tire cleaner" ... I asked him about it and he said he didn't know but I knew it was her because I saw her snapchat and it showed her user and even on snapchat she as under "tire cleaner" and he acted like he didn't know and I started getting mad and I just said " okay thanks" and hung up and he called back and said " seriously?" And now I'm sitting here crying like an idiot because he always tells me that I'm the flirt and that I mess up in the relationship.. That's pretty sad because then he LIED to me.. He's gone all day cause is job is car washing with his friends.. What would y'all do ladies ??..