I would really appreciate some help here. So here is the story. A friend of mine and I met a girl at some mutual friend's dinner party. Both of us thought she was quite cute. Since we are not that tight and don't really talk about things like hitting on girls, we don't have a "Bro code" in place to resolve any conflict of interests. Throughout the party, I thought I had a good vibe with the girl. She laughed at my jokes and even told me that she really likes my sense of humor. On the other hand, my friend took a lot more aggressive approach. When we all bounced from place to place, he would always try to walk next to her and talk to her. When it started raining on the way, they cuddled under the same blanket. Basically whenever we were walking, my friend would always be a step ahead of me in terms to walking next to her. Honestly, I don't know if this was a result of his aggressiveness or the girl's making it easier for him, or a combination of both. At the end of the night, he was the first guy to offer to walk the girl home and the girl gladly accepted. The rest of us just went home by ourselves.
How do I get over my jealousy and possibly do better?
I get pretty jealous of him especially since he's considered a pretty good looking guy and I have some serious inferiority complex (although girls have called me cute before). When my friend and the girl were walking together sharing some special connection, I was just fuming in jealousy and self-pity and couldn't even think straight. All of the PUA, inner game stuff I read just went straight out of the window at that moment.
The other thing is that all three of us will all be going to a weekly salsa workshop, where people can dance with whomever they want for practice. I really don't how I am going to contain my jealousy and handle the situation there. I keep picturing in my head that my friend and the girl will just dance with each other all night long. From a completely honest and selfish point of view, I like this girl and I really want to win this girl back. And I am pretty sure that my friend and she haven't hooked up yet. I would appreciate some advices on that. But, I also wouldn't mind advices on just moving on and getting over my insane jealously.
One extra piece of information is that after the dinner party she friended me on facebook but not my friend. I don't know what to read into this.
Thanks for your help!