It's normal for people to appreciate a female breasts, that doesn't make you pervert. Having said this , most partner would prefer their partner not be physically ( or sexually ) be interested in others when they are in a relationship with them ( atleast overtly) and same apply for pics on your social media sites . It's just your partner showing her disapproval and dislike in her own way.
Next Steps
it depends on how serious your in the relationship, there is no right or wrong. if you're partner doesn't like it , how much are you willing to change