"Bro's before ho's" means not fucking your friend's girl or getting up on some chick that you know he is really into, in my book. Once you start seeing a chick, I don't think you should ditch your friends altogether (why would you want to, anyway?), but it's a given that you're going to be spending quite a bit of time with la chiquita. Your friends should understand that. When things go sour, show up with a six pack of beer and no questions are asked.