Having been in that situation, I'm going to go out on a limb here and say that what really bites here is not only that a "bro" has done this, but that in this girl's eyes you're not #1.
Think about that. I know well enough because I've been there. You want girls you're ****ing to be all over you, exclusively, or at least not see what they're doing with other guys if you aren't exclusive.
Now of course, the other side of this is your friend acting on it, for which there's not really an excuse (except for, say, they were both drunk out of their minds). I've never been in the situation to make an actual move on a friend's girl, so I wouldn't know how I'd react to it, but for those few very good friends that I fully respect, I wouldn't lay a finger on their girls.
So there's two sides to this, in my opinion. Your ego has taken a blow and they both behaved out of line. So you learned something about three different people that day.
p.s.: I'm not saying this is easy. I'd feel exactly like you in that situation (again, I've been there) and I believe this is human. SoSuave is all about not letting this get to you in the slightest, but we're all human. People who feel 100% sure of themselves all the time are OBNOXIOUS. Self-doubt is, to some degree, healthy.
Think about that. I know well enough because I've been there. You want girls you're ****ing to be all over you, exclusively, or at least not see what they're doing with other guys if you aren't exclusive.
Now of course, the other side of this is your friend acting on it, for which there's not really an excuse (except for, say, they were both drunk out of their minds). I've never been in the situation to make an actual move on a friend's girl, so I wouldn't know how I'd react to it, but for those few very good friends that I fully respect, I wouldn't lay a finger on their girls.
So there's two sides to this, in my opinion. Your ego has taken a blow and they both behaved out of line. So you learned something about three different people that day.
p.s.: I'm not saying this is easy. I'd feel exactly like you in that situation (again, I've been there) and I believe this is human. SoSuave is all about not letting this get to you in the slightest, but we're all human. People who feel 100% sure of themselves all the time are OBNOXIOUS. Self-doubt is, to some degree, healthy.