well fuck. basically, nick was right. she was in the pub, so was my friend, i didn't feel like competing, so i fucked off, she called me back to the pub, so i came back, when i came back they were a bit coy, but ended up basically fucking on the dancefloor, and then went home together. i don't like people taking the piss out of me, so i'm going to have to do something about this. it's fine that they want to do that, but the way it was done was fucking sly, underhand and plain disrespectful. this "friend", never fights, and is scared shitless of the very prospect, so in the lack of doing anything genuinely evil, i think i'm going to shake him up a bit, and make him think i'm going to hurt him. either that, or pussy out and mope for a few days. probably the latter.
This is the first time I've read this thread, but I don't really get what's going on here. My understanding.
-There's a girl you like, she seems to like you as well.
-She's throwing out mixed signals, which could pretty much mean anything considering how every girl is crazy in a different way.
-Your friend has cockblocked you a few times.
-You're at the bar, your friend is laying the mack down, she seems somewhat into it, and you don't want to go through the effort/drama so you leave.
-She calls you to come back, you do, and they end up going home together, but they tried to hide it?
The last part is pretty much where I get confused. Do you think they did this intentionally to piss you off more, or just because they wanted to and your feelings weren't really a huge consideration? I'd be willing to bet the second.
The thing that's stupid is she fucking called you back, which is something a girl would totally do and think they were helping the situation. Your friend probably figured it'd be for the best if you left (for more reasons then just him winning out with her), but she figured that she could try to fix the situation and not hurt your feelings by calling you and basically saying she wants to hang out...but fuck your friend.
Either way, it doesn't matter. Fuck both of them. Chances are they didn't want to play this game (except maybe her - there's a reason so many girls lead dramatic lifes), but it's unaviodable. The end result is that the situation pissed you off, and it could have been handled a lot better by either one of them had they had the balls to straight up tell you the truth in the begining.
Make a decision about what you're going to do about it now. It's entirely up to you how you want to handle it obviously, but personally I'll only actually fight friends about stupid shit that doesn't matter. If you're pissed off about it when you're sober - you don't fight about it - you just aren't friends anymore. If it's a drunk argument that escalates, you'll usually get in a drunken fight and laugh about it later when telling the story to people. Don't even go through the effort if you're that pissed off about it. Just get your shit back from the passive agressive retard and don't hang out with him anymore. Make it pretty clear that you're not friends without actually saying that, and as far as the girl is concerned - she doesn't exist, which works because the girl you thought she doe probably doesn't exist anyways.
Don't mope about it, but don't create more of an issue then you should. There's things you fight about and things you don't. It's not your girlfriend - they both just seem to lack foresight and social understanding. To actually fight about it is just going to create more drama then it's worth. Make sure you let them know you're fucking better then them, and don't let them forget it.
Oh, and try to bait her into giving you the "look, you're cool and I'm sorry for whatever. I'd love to be friends." Go along with it until the end, and then drop the always classic "Fuck you, I have enough friends." with a smile on your face. That kind of drives the point home, and when she tells people about it you sound pretty awesome (assuming she's telling a guy, if her girlfriends don't know you they'll probably hate you). The other benefit of situations like this is the bitter drunk you get when you're around them, even if you don't really care. Bitter Drunk is the fuel of good stories and fun memories.
As for calling your ex, fuck that. Seriously. Don't be one of those people who loses all self-worth when they're by themselves. I understand that I might be a little different then most people in this respect, but don't do anything stupid because you think you need someone else to make you happy.