Not sure if I’m being to sensitive…

I’ve had issues with my fiancé liking or following certain things. I’m not against porn or him following or liking models or whatever but I’ve had to bring up that it makes me uncomfortable that he followed a XXX page of a girl he knew from high school. He unfollowed and a few months later I noticed he followed again. When I asked him he said he “didn’t notice” then unfollowed again. Now I noticed that quite a few of the girls he knew from high school post very explicit content and even stuff from their OF pages. On one hand, it’s getting me very upset especially bc from the start I know I’m not his usual type and from what I can tell (he refuses to tell me a lot about his ex’s which is already weird) all of his ex’s were so different from me. Which hits my insecurities just a little more and now seeing that he still likes and follows girls from high school that post stuff like that. Like no shame to those girls do you post what ever you want. But damn I feel like that’s a little embarrassing and hurtful. Like those girls can click on his profile and see he’s is in a relationship and yet he’s still on there liking those posts. I don’t have friends that I can talk to about this stuff so I just want to know if im being a little too sensitive or if this might be something warranted that I can be upset about?