Bf keeps checking out other girls when we are together

😞 I don't know if it should be tolerated.

Whenever we are on the dates and we walking together, I notice he keeps looking at other pretty girls. And when I was trying to have a conversation, he did not even hear what I said because he was too busy checking other girl out. I see where he is looking at all the time. The other day at the food fair, i was serving him a dessert to his mouth from my hand. His eyes were looking at the other pretty girl walking with her bf. And there are many times when I sit in the car with him and he was driving. He looked at girls walking on the side street and even turned his head around to look at them longer. 😔 The other day he even commented on the girl crossing the road with summer dress saying that she has pretty face and the dress suits her. And I just agreed, because I don't know how to react.

I know it is normal for guys to like seeing pretty things. But why does he have to do that in such obvious manner in front of me? Does he not care how I feel at all? I feel left out every time he does that. Like...I'm here besides you, on a date with you. Are you not going to give me a bit of your attention?

Should I just tell him that his action makes me unhappy? Would it turn out that he would see me as nagging or greedy? 😖