ohhhh, i think i understand what you are asking now. ok, so your close friend and love interest got together even though they both knew you liked him. and even though they've broken up now due to her, you're still bothered by the fact that it all still happened. is that correct?
in that case, i think you should forgive the situation. you don't necessarily have to feel good about what happened, but they are, like tina (KhoOnxNouxWanxJai) said, only two people with feelings too. after all, you did tell him to make the move. he made a decision. he chose the other direction. that doesn't necessarily mean that she's better. it just means that he had his reasons.
plus, you shouldn't pine over someone who decided to go the other direction before he looked your way (not that he is necessarily trying to get with you now). but if that is the case, don't turn into sloppy seconds. i don't know, that just my take on it. i mean, i don't really know the guy. maybe he's a good person that initially decided to go the "wrong" way but now decided to go the "right" way. though there is no right or wrong way in this matter. this is just me speaking on his behalf as if he was a good guy. haha
either way, you know the details more than we do. do what you gotta do to make yourself feel better again...even if it means walking away from them. just remember that you told him to make the move first. just as much as him, your friend may see that as a green light opportunity.