Coworker cockblock? why am I pissed?

Anonymous
Me and a girl coworker have been friends for 5years really close
She had a boyfriend during this time and never interested in any guys
Things are bad and not working out for them

So we flirt on Snapchat and at work and she tried to meet me for a drink with her friend
From the snapchats it was obvious she wanted sex with me
The problem is she was sending Snapchats targeted at me and 2 other coworkers who have gfs were getting them also and he told a lot of the other work guys who all joined her on snap
One of the guys who found out and he started flirting with her and trying to get with her knowing she's after me
Whatever he said he cockblocked me and is having sex with her and he has her ignoring me completely when we've always been friends

How do u deal with a situation like this?
The girl still obviously likes me and we have sexual tension but the other guys ruined it all on purpose and she fell for it all?
Do I just ignore it all? I do fancy her but maybe she is nuts too if she goes for any cock
Coworker cockblock? why am I pissed?
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