Personally, if anyone said "Bro's before Hoe's" to me, he would be gone. No question, no excuse, just done. You are not a Ho, you are someone he chose to be in a committed relationship with. If he is your fiancé, then he has chosen to spend the rest of his life with you. NOTHING other then God should come before you, in his mind.
If he is disrespecting you now, what will it be like after you are actually married? This might be a good warning to you and something you really need to determine if you can live with.