Boyfriend liking sexy pictures?

Okay I don't know how I should feel. My boyfriend told me a while ago he was upset that I liked some of my ex's instagram photos. We broke up in good terms, that's why we still have each other's instagram.

I apologised and said I won't like his posts again. A week later he told me that he's been liking this model's posts just to piss me off. He was hoping that I could see that he's liking this Japanese model's photos and videos (that are quite sexual)

I'm not sure about how I should feel. I know I'm okay with him watching porn but he is kind of obsessed with this model. Would you ladies be okay with that?