My boyfriend liked another woman’s bikini picture, should I be upset?

Hello everybody, I am a 23 YOF and my boyfriend is a 26 YOM. We have been dating for just about 3 years now and we have recently moved in together. We have been living together for about 8 months and I can honestly say it is going great. It was a fantastic transition, we have a blast together, and I feel that it has taken our relationship to the next level. Getting engaged has even been a thought on our minds lately. This all started yesterday. My boyfriend is very loyal. One thing I’ve always admired is he doesn’t like certain things in social media. An example is is follows Sidney Sweeney and never likes her post…I know he sees them, but it is nice to know that myself and our mutual friends can’t see his admiration for her. This all started when my parents were looking at my sister’s husband’s instagram page yesterday (he is a POS). They found that he was following a lot of women who posted pictures half naked, and he was liking a lot of them. My parents were appalled and I was surprised myself. This caused me to look through my own boyfriend’s following. I was almost to the bottom and I was super relieved since he only followed old college friends, and liked none of their revealing pics. Until, I found an account with a girl who posted a good amount of bikini pics and my boyfriend liked most of them. She was someone he went to college with, and it appears she has a girlfriend. Regardless, my concern was not him trying to cheat, I just feel a little embarrassed that other people can also see that he liked it. My boyfriend is literally perfect in every other area. He listens, communicates, and takes great care of me and my dog. For that reason, I think that’s why I’m so upset…he never does anything that makes me uncomfortable so I don't know how to handle this. I feel like if I bring it up, I’ll sound crazy. But, holding it in is making me irritated and I can feel myself being in a bad mood. Any advice on if or how I should bring it up?

My boyfriend liked another woman’s bikini picture, should I be upset?
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