Is my boyfriend lying or did he generally forget?

My boyfriend got a text on his phone he has an iPhone 5, and he picked his phone up and scrolled up in an upwards motion with his finger, and then he said do you want to see my text, turned his phone around and scrolled across a few pages to get to his messages, then I asked him why was he scrolling up? And he said he wasn't scrolling up he was scrolling across ( but I seen him scrolling up when the phone was turned away from me ) and I seem him scrolling across when his phone was turned to me.

I then said was you on your contacts scrolling up or something? As he has called someone before, and he said yeah that was it! Like he forgotten he was doing that?

Is he telling the truth he generally forgot? Or was he lying? What else could of he been doing?

Liar liar. Obviously something he doesn't want you to see. Calm down and don't jump to conclusions. There are many different secrets with the same odd behavior.