listen to bro or ho

Heres the story, my 2 friends called me and wanted to throw down on some illegal substances while i was at my gf's baseball game. I was a little broke at the time so I said i could only pitch in $10 and they said that was ok and that they could handle the rest of the cost. Before we went to do our thing, i asked my gf if she minded being with me while i did this and she said it was alright. But when we started all she did was ***** and ask me if she could drive my car but i said no(she failed the driver test 5 times) then she kept complaining and my friends started calling her a *****. Anyways when we broke up she said that the people i smoked out with were just using me and the stuff only costed $10 bucks total and they were using me. who should i believe? I know the saying is "Bro's before ho's"