Boundaries

What are the boundaries you and your SO have? For me is flirting(even if unintentionally), liking female lingerie pictures/half naked pictures/sexual ones, like he can have female friends but if I shes getting too 'touchy' i would not tolerate it and speak to him etc.

I want to set some boundaries in the relationship as some things make me feel disrespected/uncomfortable, we've been dating for almost 2 years and haven't had a boundaries talk yet, I already brought up one thing to him before about an ig model, not the fact that he was following her but the fact that he was liking her nude/lingerie pictures and it made me feel uncomfortable(he unfollowed her on ig without me asking but still follows her on other platforms).