If your friend was hooking up with your ex boyfriend of a year that you dumped, would you be mad if they were hooking up without telling you? This is my predicament. I'm hooking up with my friends ex boyfriend and have been for a few months, and my ex boyfriend is also his friend. Very complicated. She just found out and I'm just trying to get input. We didn't tell either to spare their feelings, and it really wasn't anyone's business but ours, but we weren't going to lie about it. What would you do if you were me? If you were her?