Pissed

So I’ve been having this feeling that my bf is doing something so I told him how could you lie to me I thought you told me that you wouldn’t hurt me again and he said what are you talking about and then went to go get his phone. Like why would he go look at his phone if he didn’t have anything to hide??

I don’t know if it’s just my hormones or if I should be mad. If he had nothing to hide then why would he go straight to his phone ?