Platonic or nahhh

I've been done so incredibly dirty by this girl that i liked and I don't even know how to process it. She treated me like genuine dirt and i don't even know how to even rationalise it or make sense of it because I truly don't understand her thought process. When she initially found out I was moving she was literally the sweetest girl on the planet like she was really really nice and really like emotional especially on the last day of school and she was saying how she's going to miss me so much and she's going to miss my smile. Like what the hell. And on the occasion when we hung out, just the two of us, she was saying how she can't imagine seeing someone else in my seat and when i move she has to make plans to see me every 2 weeks or so and she doesn't want to lose contact with me all of this soppy stuff, which i found really sweet and by this time I was past the point of even trying to convince myself that i didn't like her. But you would think nah okay it's whatever you know, like maybe because we are newly friends and what not she feels extra emotional, like who even knows so its whatever. But no. Even before this whole moving incident and before it got closer to the end of the year, she was still incredibly sweet and teasing like the girl was always touching me whenever she saw me and it became a thing where she would see me literally anywhere in the school and tap me and then when i looked back and saw her she would try and play it off, like it was our inside joke, cute. We were also in the same class and when i say every lesson she was asking me to move and sit next to her. Every single bloody lesson she was asking me to move to sit next to her because the teacher didn't care. Like are we serious right now, and mind you she had other friends in the class so there was actually no excuse, like it was always me. There was also a time where our teacher wasn't coming and she was trying to drag me to do laps with her to waste time and I literally had to hold her in place and move her like brooo, whattt. Don't even get me started on the eye contact, gosh i swear it's insanity the way she acted towards me. And since I've moved like we've kept a good amount of contact like through texting and sending tiktoks and whatever, like we've been talking consistently and still she's been real friendly and teasing, sending me things saying this could be us whatever, and saying how she's happy to have met me whatever. And I remember when i sent her a tiktok of a cliffside beach view and the caption was 'this and i push you off' and she replied with 'please do.' i beg your pardon. explain in detail what you meant by that right now because huh. Okay unrelated, but the point is we have had a lot of context before this essentially and now recently I travelled back to the main city to visit my other friends from school and we saw her like by pure chance when we were walking past the bus stop, and i literally froze, like after i said hi to both her and her other friend my mouth and brain were both empty, and i turned away to pretend to talk to my friend, because i literally couldnt. and my friend even took a picture of us and i was turned away to my friend and this girl was looking at ME. like WHAT. it was a whole circle of convo and she was looking at me when i wasn't even involved, cool. So yea embarrassing. But my main issue comes from this, essentially i had a joint halloween birthday partyy with one of my friends, i invite her naturally, she says she can't come, i say aw but i move on cos its whatever, she then comes back to me. and says, ' hey just wanted to let you know that ill be able to come on saturday.' cool, i say yipee and we move. and then imagine my surprise when i see her texting me next day, she can't come. coooollll, **** me then. like i don't care its cool but i would've preferred she kept her first answer or at least gave me some sort of reason as to why she cant come because all this time i have no further explanation of why like what changed. but cool. then has the cheek to tell me 'hope you have fun tho!' and i remember i said that i'll try and she said that I definitely will and then said that she has a gift to give to me so we should plan a day to meet up over the break so she can give it to me. cute. i said oh its fine at least ill get to see her at some point. WRONG. party passes, i drunk vlog her, she tells me to sober up and says she needs a fit check. whatever. time passes now, shes in a funny mood again where she literally blanks me and gives me bare minimum except maybe one snap for the streak and nothing else, as if im a bloody stranger but cool. this goes on for some time, and it is not 2 weeks later since the party (aka this week ) but this time im lowkey over it because i actually need emotional stability and consistency in any sort of relationship - platonic or not. then tell me why in the midst of her blanking me, i see her posting a story of a halloween party she went to. cool. so you have the effort and time to make time for other parties but not my birthday.. cool. and maybe it would be different if i knew we hung out and whatever but nah. she blanked me in all sense of the word, literally didn't try and make plans once. cool. now i'm just confused with life, especially because it was literally last week that i had that awkward encounter with her and she was really smiley with me sooo...
um but yea, sorry this is long, and idk give me advice, i think.