Is it against bro code?

​So I started talking to this girl and things got pretty hot, but she said she didn’t want to have sex just yet. I asked my friend what was up with her because they have been real close for years.. I didn’t know how close.  They had been fucking on the reg, FWB for two years. Being around them you would never know it, they acted just like normal friends. We didn’t talk about it again, but I kept hanging out with this girl and talking. I really wanna ask her out and see if its anything because I like her, but is that against brocode?