He got defensive over his phone?

boyfriend was shitting and he was in the bathroom for a while so I got suspicious and went and opened the door on him and he got super nervous and defensive...

he also is very opened with his phone so it made it weird that he put his phone near his leg so I won’t see and after that I got mad and said why he was being weird there was nothing suspicious on his phone but the way he got makes me wonder..

am I overreacting or is this odd behavior? We love each other he seems good to me but sometimes he acts suspicious and makes me question him.
He got defensive over his phone?
Post Opinion