If you're obviously affected by a breakup it's a total D**k-move for your best friend to then go out with the 'someone' in question, (unless they asked you and you didn't say "no").
What I would recommend is spending some time away from your best friend and this 'someone', perhaps spend more time with some other friends, but don't make it look childish and silly because it's not, you just need your space right now.
But as I said before, unless you gave them the ok, you might want to reevaluate how good of a friend this best friend is.
Woah! Do not do this! She is your best friend! i think its better if you tried going out with someone else! Else i am afraid you might lose your best friend...
Yes, you can fall in love with your best friend. You cannot control falling with someone.
Talk to him/her 'bout it. Or try to love someone else.*
you keep going for his best friend and be honest!
You know your in love by sharing something special with someone but be caring because if you become best friend then start going out you can never get out of it especially being F.W.B with that person or true love.
dating a best friend works every time
When he tells your best friend, that he have's a crush on you.
Uhhm wow... Well you should support them being lesbians.
If he's your "true love", why is he going out with someone else, particularly someone so close to you? I don't know about you, but my definition of "true love" wouldn't include dating other people. Perhaps it's time to reassess the true nature of your relationship with him.
Kill both of them and then laugh at there misfourtune
If you love someone and they are good to you then follow your own heart and not how your friend feels. It's not uncommon when best friends have been together a long time and one finds someone of the opposite sex to love because the friend left behind is jealous and fearful of losing that close best friend connection.
Answer:MOVE ON