How do I get over betrayal? It wasn't even that bad but

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How do I get over betrayal? It wasn't even that bad but it hurts all the same.

>be 3 months from graduating high school
>moved here this year from a different school and made a nice friend group
>no serious friendships, like best friends, just some good ones
>my high school has a policy where you have to walk with someone when you graduate
>my closest friend I asked at the beginning of the year
>he said he would walk with me but didn't think he was gonna graduate, so I started motivating him and helping him get better grades and keep up with his homework
>he had almost all A's last semester and is gonna graduate on time
>we become good enough friends for him to tell me that he has a crush on one of our friends, let's call her Ana
>she has a boyfriend and he won't ever be able to get with her
>today I walk into lunch
>already a little moody
>Ana looks over the lunch table infront of everyone
>"who are you walking with ?"
>she already knows that I was gonna walk with my friend
>uh... well I was gonna walk with Tommy
>"oh, that's who I'm walking with ! "
>oh...
>"yea! Might wanna find someone"

I know it's not the biggest of deals or that bad, but now I gotta walk with someone I don't know and im already awkward enough. I'm pretty sure Ana is just pissed at me for calling her out on her marijuana addiction, but she has so many other friends she could ask. What happened to bros before hoes?