I [29m] don’t know if I’m paranoid or if my fiancé [29f] is hiding something after 7 years together. What do you think?

Over the years, there have been multiple times where she’s entertained guys on Instagram. By “entertained,” I mean she’d message them regularly, give them a lot of attention, and tell me they were “just old friends.” I never saw any proof they were actually old friends. One of them was someone she’d matched with on Tinder before we got together. According to her, they never met in person.
I used to trust her 100%. I wasn’t the type to check her phone or social media. The first time I ever did it was because I had a gut feeling that something was off, and unfortunately, I found exactly what I was worried about.
Recently, I started getting that same feeling again. I noticed on social media that she seemed to be giving one particular guy a lot of attention. I know what I did next wasn’t right, and I’m not proud of it, but I wanted to see if I was imagining things or if she was actually fixated on this guy.
I removed him from her Instagram.
She noticed almost immediately.
After that, she changed the passcode to everything, deleted Instagram off her iPad, and even disabled message notifications on her Apple Watch. When I asked how she noticed so quickly if he wasn’t a big deal, she said she realized because he stopped viewing her Instagram stories.
That answer confused me. I asked, “How would you even know he stopped looking unless you were paying close attention?” She also said he hadn’t liked her stories, but when I checked before everything got locked down, I noticed the message history with him had been deleted.
I fully admit deleting him from her account was wrong. I’m not trying to justify that. But after years of similar situations, I wanted to know whether my gut was actually picking up on something or if I was just becoming paranoid.
I’m also not really looking for “just leave.” I know that’s the obvious Reddit answer, and I’ve already told her this is the last chance I’m willing to give.
My question is this:
Does her reaction seem odd to you? Specifically noticing one person’s absence almost immediately, locking everything down afterward, deleting Instagram from one device, turning off Apple Watch messages, and changing every passcode. Does that seem like someone protecting their privacy after I crossed a line, or someone trying to hide something?
I’m genuinely looking for objective opinions because after 7 years, I don’t know if I’m seeing things clearly anymore.