if they really just friend then going out together like normally bff hangout they will obviously caught the attention because of many speculation out there which is believe they r dating(like u do). If they just a loveline it will bring them into rumour which is giving them bad impact in their relationship. And this also gives them hard n struggle if they have own lover. It's so tiring for them to have this relationship. Can't you feel it?. Just my two cents. Sorry for my suck gramma