I have a confession... I’ve been seeing my brothers best friend for the past few months and we’ve been sleeping together for the past 6 weeks or so. Neither one of us expected things to turn out like they have. We both fell in love with eachother and now are keeping this big secret. What should we do?

Contemplating whether we break it to my brother that we have been seeing eachother for months now & have fallen in love or... if he should ask my brother if he can take me on a date and go from there? 😔