BG: Mid 20's, in a LTR of 1.5y, read NMMNNG, WISNIFG, 160lbs 13%bf.
1RM: BP 190 OHP 110, DL 230 (no SQ because of leg problems. DL affected as well).

LTR always been great, a lot of sex, always flirting, doing a lot of fun (I vetted her and had other plates before going LTR route).

 

Usually I feel very confident with shit tests and boundaries, and it's noticeably important for my LTR to respect me and my boundaries.
Lately I've noticed myself feeling butthurt when she posted a pretty revealing bikini mirror pic on her IG story for the first time and it caught me off guard since she never did anything like this, it's usually way less provoking and I get those kind of pictures only privately. Since I got emotionally butthurt I wonder if it's just my insecurity and I should STFU or if that's her pushing my boundaries and I should establish them better.
Of course if she was f.e posting her boobs I'd very easily tell myself (and her) "I don't date women who do stuff like this" and leave. Alternatively if it was the usual pics I wouldn't mind, but it's right in the middle where I don't understand if I'm just insecure or I should act to establish that although she can do whatever she wants I don't like it and if it repeats or get more extreme that'd be pushing my boundary.

 

I'm pretty ashamed with myself that I'm even invested in something like this but it is so I hope to learn a lesson here and not get so confused next time.
Would love to get some advice.