Why do guys do this, I don't understand?

Anonymous
I've been dating a guy for a year and 4 months.
When we watch TV he talks about how sexy the other women are. He gives his opinions on there looks and compliments them. But it's not just a quick one comment, it's a detailed sentence or two comparing them to other women and how they are not as good looking ad x or z.

This makes me feel uncomfortable. I told him this after we got back together. He apologies and said he never meant to upset me.
2 weeks later an he did the same thing.
He said he likes to wind me up and get a reaction.

I felt physically sick about this.

To me, I've outlined a boundry and he crossed the line.

I would never sit there an look at another man, let alone make any comment on them, simply because its no disrespectful to a partner.

What does he not understand?
Also he is 40 and I'm 29 (physically fit and attractive)
Why do guys do this, I don't understand?
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