<human>: Could you distill the essence of the text into 1-3 sentences?

Background: I'm (17M) senior in high school. I've been madly in love with a girl (let's call her "backstabbing Becky") my same age since seventh grade, and nothing has ever worked out so I tend to be sad around her because her presence is a tease. No throwaway because fuck. 

So this happened last Saturday. My high school varsity football team was throwing a big party in celebration of our season starting. Keep in mind, me and my best friend both start on the team and are pretty cool guys. (Not to sound cocky sorry) I drive myself, pick up backstabbing Becky, and we head over to the party. Keep in mind, I was planning on going in for the kiss tonight after the party and taking her to a look out at night. So we get to the party and everyone is just throwing back shots like their name is steph curry. Meanwhile, backstabbing Becky is no where to be seen up until I have to take her home. I call her phone multiple times with no answer. So last resort I call my best friend to see if he knows where she is and to tell her to meet me at my car. Standing by my car I can see my best friend (clearly borderline alcohol poisoned) stumble out of the house with no pants on and lo and behold, the girl of my dreams is giving my best friend a walking-in-the-pants hand job as they both approach my car. Worst part is, is that she was sober. I guess my facial expression and lack of talking to her as I sped to drop backstabbing Becky of at her house made her realize what she did. She's been texting me and apologizing for days but I can't respond without getting too mad.
<bot>: brought girl of my dreams to party in hopes to get with her, instead she gives a hand job to my best friend. RIP 2 relationships.