Advice needed?+rant

I 24 M Met a girl almost a year ago. Became close friends with her soon. We shared everything going on in our lives with each other. Thought she liked me (there were signs). I liked her way too much to even explain in words. Brought her chocolates and stuff every other day dedicated all my efforts to making her happy then when I asked her out on a date she said she only sees me as a friend and would throw up at the thought of going out with me all of this happened after we went out once. She knows I like her (I confessed it to her face-to-face when we were out once in a moment of weakness) after this I distanced myself from her just to protect my feelings I mean the friend part was okay but throwing up and all just ruined my mental health. She went on to remove me from all the social platforms.

Fast forward few months she unblocked me out of the blue we started talking again things were looking good, bought some stuff for her which i knew she wanted from me(quite literally asked me to gift her this she might be joking but i got those anyways) and the very next day she texts me that she is going on a date with another guy and she was asking me for suggestions on where to go and everything removed me from her alter spam account on ig. She sent me reels of stuff and was like gift me this and this etc etc so I bought some stuff to gift her in hopes that things are going well Everything seems too hopeless now, she was the one girl whom I liked after way too long gave all my efforts and she left me heartbroken and even taunted me in the name of asking for a recommendation for her date.

I feel too stupid for caring and am questioning putting in extra efforts whether it's bare minimum like taking out time from a busy schedule to text her or any other things that I don’t think I even feel like sharing everything that I did. I have started to doubt myself on a lot of things and it's not even like I am not successful or even bad looking.

Help me out in knowing where did i go wrong, was putting in too must efforts a mistake, I don’t feel like I will be able to put in any efforts in the future with anyone else but that would not be the real me. Pardon me for questioning everything its just that a lot is going on in my mind and i am not able to find the answer to any of my thoughts.

A lot of details I haven’t shared and posting this from an alter account to keep this private.