Girlfriend & Instagram

i've been in a relationship with my gf for 3 years and its all been good, we both follow each other on instagram and the other day on my news feed it showed that she liked another guy's pic and he didnt have a shirt on...,this guy used to be in the same high school as her, should i be worried about this or am i overreacting or being jealous?

Put the internet to work for you. via Personal Recipe 2629984