Is he really into me?

I have been with my boyfriend for about 9 months. I know for a fact that jealousy is a natural human instict (?). However my boyfriend constantly makes comments about other women, of how they look. If he finds them pretty, and sometimes takes it to the next level as to have a conversation with them(like he did with the cashier from the grocery store the other day) and told me all about it afterwards. We have talked about it, of how it’s makes me uncomfortable, and insecured, and makes me wander of what he really feels for me? Is this normal, that he comments on other women, and says comments like“Oh wow, she looks goood in that photo.” I must add to this that he is thirty-four, and has only had one serious girlfriend, (I’m his second serious relationship he has had.) I am twenty-three.