Back in highschool, I thought I was best friends with a girl on my sports team for 3-4 years. Through thick and thin I've been there for her. I supported her through devere depression, bullying, abusive home life, multiple suicide attempts, giving her my clothes when her dad periodically burned hers, bringing her food from my house, spliting my bus tokens so she didnt have to walk home from practice late evenings(you have to qualify for them), letting her wash her clothes and bathe at my house so she didn't get ridiculed, stuck up for her during a time she nearly got expelled wrongfully, and just being a good friend to her in anyway I could.
Long story short, senior year, between classes when I asked her where did she want my mom to take her out to eat for her birthday this year (my mom was doing this the past few years), she told me she was going to out with 'A' and 'B' this year because "I only want to hang out with friends, but I'll see you on Monday."
I didn't even know what to say and stared blankly at her, then went to class then practice. I felt hurt and was so salty that McDonald's could've used me for their french fries for a long time after that. I haven't spoken to her since.