Is it okay for a boyfriend to look at other women in front of you?

My boyfriend on several occasions has looked at other women in front of me. They are long stares. I've told him how this makes me feel but he told me that all men do this, and that it means nothing. He has told me that he is attracted to me and that looking in the direction of other women does not mean I am less attractive. I really don't know what to do.

Is it okay for a boyfriend to look at other women in front of you?
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