Boyfriend creeps on other girls' instagram?

my boyfriend and i've been together for over 1 year. Our relationship is great he makes me happy and tells me everyday tthat he loves me. He even told me that he wants to get married and have children. However, I found out that he has been stalking random girls on instagram. Some pics are innocent others are very provocative. I actually don't mind him looking at nudes or other sexual images. What frustrates me is that he constantly looks at particular list of girls who are all very attractive (these girls don't post any revealing pics). He doesn't follow these girls, like or write comments on their instagram but I don't understand why he needs to keep looking at these group of girls. Whenever I ask him about this he tries to avoid or prevaricate the conversation. He says he loves me but I'm confused. Why would he do this if he loves me? Or am i being too petty and insecure? Please help!
Boyfriend creeps on other girls' instagram?
Post Opinion