Relationship question

Bri • Hello everyone I`m Bri and I`m 24 years old and I am TTC 😃
My boyfriend cheated on me with this girl last year and it broke my heart to the core. The girl followed him on Instagram and I unfollowed her and blocked her, but I'm not sure if he unblocked her or I may have never blocked her but here she is liking his pics on Instagram. What should I do? She lives in another state so he'll never see her again but i don't want her on his page it's been a year would I be petty to bring it up or am I making a big deal I don't want her liking nothing I feel like when he saw that he should have blocked her? I think Ima say something because I can't hold my breath