To be mad or not to be

Katiemarie
So today while going down on my boyfriend I was facing his penis while sucking it and I felt his hand behind me, he was grabbing his phone.. I turned around and saw him quickly shove the phone in the pillow.. He was looking at porn while I was giving him head... I don't know why but I'm livid angry!!! My friend said I shouldn't be..would anybody else be angry or upset ???