Maine Pyaar Kyun Kiya?

I guess it requires a special talent of some sort to get into some sort of weird trouble every now and then and I think I have mastered the art. But the mess I have got myself into this time tops every chart... Once again, I think I'm in love...
I can't stop thinking about her, every time my phone beeps a message or rings I hope its her, every song I hear reminds me of her... every moment I am awake I keep thinking about what would I say or do when I meet her... Well, Big deal! Its not the first time this has happened... but this time the story gets a whole new twist....
The "her" is the above sentences happens to be my best friends girlfriend!!!

"That's the cue for a change-over. The movie keeps on going, and nobody in the audience has any clue." - Fight Club

I'm in such a big dilemma that even Raju Rastogi's dilemma when he had to choose between his friend and his engineering in 3 idiots sounds light.and to add to it, the couple loves to hangout with me
a usual conversation in office goes something like this
Friend: Saturday chalega ghoomne

Me: Nahi yaar kaam hai

Friend: Chal na, teeno masti maarenge

Me: Arre yaar tum log couple ho, mai kya karunga, you guys should spend some time together without me!

Friend: Chal na

Me: Nahi re, ghar pe kaam hai

Friend: Tum bolo, tumhaari sunta hai

Her: Chalo na

Me: Kab? Kahaan? Kitne baje? Kya Pehenkar aaun?

She calls me, messages me and complains about him not calling her or giving her space or about a 1000 other things in the world, which I don't give a damn about 'coz all I want to do is to tell her.. That I'll treat you like a princess, I'll give so much time and space that you could build a dozen continuums but all I do is justify him.
Makes me feel that I'm the smallest person on earth, breaking the code, falling in love friends girl... and nothing absolutely no statement I make makes me feel good about it!!
As of now, I have created a fake girlfriend whom I use as an excuse not to hangout with them... have missed 3 hangouts and she messaged me every time that they are missing me.
Have no clue about what to do and am sure no one has!