Should I be concerned?

Please remember I am quite young.
My boyfriend had his first kiss with a girl in year 9 (I told u this would go back a far way). They never got into a relationship or anything cause he got with me.
Baring in mind this was 3 years ago that this kiss happened and he has been with me on and off 3 years casually dating (been together in total a year fully).
He still likes this other girls selfies on Instagram. She barely ever posts so it's not like it's a constant thing. He doesn't leave comments he just likes them. I guess they're friends.
He likes other girls selfies as well whom he knows so it's not like she's being singled out.
Do I need to be worried?
You're overthinking this way too much it's fine.
Vote A
Could be a problem.
Vote B
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Should I be concerned?
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