Is it normal to jerk off on grad pics?

ive been with this guy for 3years from the begining it was hard trusting him but i stayed...sex was great but not enough i had to beg him for it..i was in his room and found his grad book ..on the page of his ex with her little picture was ALL full of cum i was really discusted about it and asked him to get rid of it he did without saying sorry..is it normal that guys jerk off on pictures?