Toxic exfriend living rent free in my head

So my friend ghosted me and i've come to the conclusion that she never truly cared about me and doesn't value me. She didn't have a car and I was giving her rides to school and work. I live outside the city so round trip 1 time is 45 minutes for me, 3 times a day so 2 hours and 15 minutes of my time in 1 day I spent giving her rides. I bought her gifts for her birthday or when she was feeling sad or overwhelmed with college. I'd buy her things she needed like mouse traps or light bulbs and dropped off take out food just to make her feel better. This all went on for 6 months (friends for 3 years). I helped her get the required vaccination records for college 3 days before the deadline. And the rides for college and work had me waking up at 3am and picking her up at around 830pm.

Her sister gave her her old car and bought a new one. Now contact has stopped, she quit responding to my messages. Or in 3 days all she sends is "sorry busy and everything is crazy, I want to stay off the internet" but she's been making tiktoks everyday. She finally broke down and said "don't text me anymore". I feel like a chump, or a simp. So much time, effort and mental energy wasted on someone who basicallly used me. Is it unreasonable to expect that person to text me "hello, i hope you had a good day" or "i'm thinking about you". I can't get this person out of my head and I feel really crappy having wasted so much effort. What you think reddit? I feel pretty bummed.