Search Results: girls in tight shirts

I've been with my boyfriend for about 7 months or so and we have told about our past and all that. And he's an open guy so he tells me about these girls on his instagram. there's 2 girls that always likes his photos. And they both always put pictures showing their cleavage. Anyway, he let me go on his instagram so i can scroll through their pictures and to see if he has ever liked any of their pictures. This was few months back (he still lets me though) and I saw that he has never liked any of their pictures. So then when I went on his instagram last night, out of curiousity, I checked both their pages. And one of them put a picture of her wearing a tight v neck shirt where u can see abit of her cleavage and she had a snapchat filter on. My boyfriend liked her picture.
Her page is on private so i can't see it through my instagram, only his...
Should i get mad at this? Does that mean he finds her attractive?

Rachel is a 16 year old black girl. She wears wigs, a face full of makeup, false eyelashes and red lipstick every day to school. She also wears tight shirts and a mini skirt that her mother bought her to wear to school. She was kicked out her old school for giving oral s*x to her ex boyfriend in the girls bathroom after school. Rachel's grades consist of F's D's and C's. Rachel also sleeps in class, and spends most of her time at lunch staring at the walls of the lunch room. At school she brings a teddy bear to class, she sits in the corner talking and singing to the teddy bear. Or just hugging it with a dull expression on her face. Rachel gets five- six hours of sleep per night. Her father died sixteen years ago, and her best friend she knew since she was 2 months old recently died from a car accident, 3 years ago.