Search Results: ending a friendship best friend

-Both in HS, similar ages.
-The day before we first started, she JUST broke up with her first serious boyfriend ever of 8 months (i DID NOT find out untill way later)
-We talk every day all day for 2 weeks straight and a couple dates, i made it official. this girl is completely open and honest about EVERYTHING. Amazing chemistry with her
-She told me she wanted to be just friends with her ex, she says they both know eachother VERY well and she doesn't want to lose that friendship

Bad:
-Week and a half later acts distant, starts to come up with weird bizarre excuses that maybe i shouldn't be be with her (she has very bad anxiety and overthinks a lot. this was not some passive aggressive way to break up with me).
-We start talking more about it and she tells me "I think I still love my ex boyfriend __"
-I try my best to talk her out of doing something stupid (leaving our relationship for that bad one) and she was listening but seemed very sad about hurting me and was still wanting to be with him. She assured me she had genuine feelings for me and i was not a rebound (and told me that many times after finding out she recently got out of a relationship). Eventually i told her to be happy and i broke up with her

Next day i wanted to talk to her in person and sorta say good byes and talk about our relationship ending.
This was her text that day before we met up:
"This is very stressful for me and i feel very on edge about all this"

When i talked to her in person and told her how i felt, she kept looking at me with puppy eyes: When i was telling her again in person how its a bad idea to leave me, all the reasons she sorta disagreed with over text she kinda just sat there and looked at me with puppy eyes and didn't disagree at all and just listened to me.