girls..and money

There are many things in life that can ruin relationships between "brothers"
2 of the main ones..are girls..and money..

There's these 2 really close friends ive gotten along with very well in the past few weeks..and established a really good relationship..we know each other as brothers..and treat each other that way as well..
I don't feel like mentioning names..so lets call them A and B..this is what happened to them in the past few days..that absolutely ruined our relationship..

One day A tells us..hey guys..theres..this..girl..
So obviously we feel happy for him..and ask him questions..and so on..we try to find out more information about her..know what she's like..and later did i know..that girl is from my church..and i know her..fairly well..how convenient =]
We get her msn..and start talking to her..seeing what she's like..and things like that..
She pops up in our conversation many times and we always ask A how's things going with her and things like that..and B wondered if he could see what she looked like..
So one sunday..all 3 of us are at church..they kind of talk to her..but the bad part was..the girl had a better impression of B..
Girl keeps mentioning B to A everytime they talk..which sort of makes A feel bad..so one day..A walks up to B and says..hey dude..because we're so close..if you like the girl..ill step back..i don't want to start a fight between us over her..
B's like nah man..you can go for her..since you like her..
Despite that..B still talked to the girl..and got along very well..as..friends..( or so we thought )

Beginning of holidays..A and the girl said..lets go out together..grab Elliot and B together..A quickly said yes..and told us to tag along..we happily followed =]
We went karaoke..had some fun..but it was a bit awkward..because since i was closer to the girl..i was talking to her and her friends more than A or B..but since i was closer to her..it was..natural..i didn't have intentions..just..hanging out..

Because it was the holidays..i rarely got to see A or B that often..because they were always out and i was always at home being lazy..
One particular day..A walked home..looking really depressed..stopped eating..and stayed in bed for ages..i asked him whats wrong..and the typical answer: oh nothing..just a bit tired..im like ok..fair enough..im here if you need to talk..
His depressing mood carried on for a few days and eventually i got sick of it..i confronted him..but got no information..

Few nights later..girl talks to me..asking how is A doing..im like he looks really depressed..and i even ask her whats going on..she said..she's trying to find out too..and saying that he wont talk to her..
Occasionally when im in A's room..the girl would chat with him but he would just close the window..and do other things..i find that weird..so i started to talk to the girl..
Girl wont provide any information either..saying it's really complicated..yadayada..
That night i went out..got home..and found A just got home from somewhere as well..i go online..and eventually forced out something out of her..knowing that she lied to A..saying she went shopping with her friends..when she actually went out with someone..
So i just thought..ok..that is bad..but i didnt ask more..
Literally few seconds later..B calls me..constantly repeating the sentence "i feel guilty for doing this to A"..he keeps repeating it..and eventually im like STFU!! and tell me whats happening!!
He says..its the girl..now in my head..i was thinking..OH SHIT!! because the girl said something about going out with someone..

So i asked for details..
This is what ive been told..
Before we all went out to karaoke..B and the girl had already been out together alone for a few times..and one of those times..the girl asked B to go out with her..for some stupid reason..B says yes..

Background on B:
B is new from China..and was initially in a gang..now we all would assume gang members talk a lot about loyalty to your brothers..and 意氣

So anyways B says yes to her..WITHOUT TELLING US!! well not telling me is fine..but not telling A..*sigh*

I asked B how A found out..he said..oh..me and the girl went out..the same day A went out..and A saw us together..
My first reaction ._.

Now everyone's not talking..and it's annoying the hell out of me..you've got any suggestions on how to fix things....tell me..=]