Why do you think the result is going to be different after a few months or weeks?
U are still going to be clingy cause u are setting urself in lower value than her.
Best way is actually looking for things to actually increase ur confidence. Something like going to gym, going to look for others girls, actually trying to find something that actually grows u as person.
Let me tell u a little secret she is not into you, ur are just her lifeboat, while she is looking for something better, ur her ego boost , her validation mechanism.
So u arent passing her shit test, she already knows you, the best way to actually pass the test, is simply ignore the fuck out, and going to pursue other things.
Ask yourself? How can she miss someone if she didnt trully lost? whenever she wants she just need to snap her fingers and u come running chasing her like a good puppy, in the meantime she can she what the market has to offer.
But trust if she is reject hard by her new fuckboy , ur are going to be first one she calls you, and maybe she will use for a little more time
I know ur girl is different from all the rest she wouldnt do that to you