Am I over reacting for getting mad at my boyfriend for liking/commenting on a girls pictures?

I have been dating this guy for almost 7 months and everything was fine until I was scrolling on instagram and a girls profile that he followed popped up in which I clicked on for fun. As I was looking at her pictures I find my boyfriend leaving comments such as "love it", 🙌🏻 And even a comment going back a year ago with a smiley heart emoji 😍 And heart emojis ❤️ Along with a lot of likes all of these commented on while we were together. This bothered me a lot because I remeber him saying that she was his coworker with a "nice ass" because she works out a lot in which she does. I had no problem with that comment. What got me is that these pictures are her in workout bras and she's almost naked, I know he also likes ass so that didn't help. I confronted him about it and he replied "I don't even talk to her anymore tbh" and that he does that with close friends. He brought in other lady friends he compliments, and that it means nothing, he said he was sorry for upsetting me and that if it bothered me he would stop. A few hours later I looked on the girls insta profile again and found that he has unfollowed her and that her account is now private. What does this mean? Did he talk to her? Anyway, I have never been jealous of insecure like this but this commenting just doesn't feel right. Am I over reacting? Are my feelings valid? I even asked him how would he feel if I was commenting on other guys pictures like that and he said that he wouldn't care, as long as he knows nothings happening. (Like what)
Am I over reacting for getting mad at my boyfriend for liking/commenting on a girls pictures?
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