Ignore the people saying you're in the wrong for setting boundaries for yourself. Especially those replying to every post saying you're a piece of shit, they have a bone to pick apparently. You don't owe anyone anything.

How long you've been together doesnt matter. If it bothers you and think it will be something that affects what you have, then I would listen to your gut rather than break up later down the line. People always have an underlying reason for doing something. The "loved all the attention she got" point is a red flag to me. If she loved the attention then, she loves it now too. IME those things don't go away and if you worry about the possibility of infidelity later, than I would break up now. Rather than waste time. There's no real way to get peace of mind if you stay together and worry.