Did he cheat?

Hollie

So I found some messages on my now ex boyfriend phone to a girl who I never heard off. They followed each other recently and messages had been deleted. When confronting this I was told I was invading his privacy (even though he’s been on mine before) he called me names like creepy. He couldn’t give me a straight answer on where they had met all he said was he deleted the conversation because he knew I would go on his phone and get the wrong end of the stick. To me it’s a red flag because I don’t delete any messages on my phone nor care to hide them. I think I know in my gut but just wish I knew for definite for my own closure.