Am I crazy or what..!?

I know I have issues with my self esteem and, I’m working on it. Thing is my boyfriend looking at other girls still bothers me . It to me just doesn’t feel right and I could see how on my end it just isn’t right. But he says he just “like the way women look” I get that but at the same time it it hurts my feelings.. like am I not enough? I don’t feel like it . How do I approach him and ask him to stop? I get its natural to notice. But not like check them out and look them up... please don’t be critical. I’m trying . It makes me feel like nothing when he does .