How do you instill new belief

I read somewhere that to believe something you have to experience at first. You can’t just believe in something. Im having a hard time in believing singing that is a fact : "there are many better girls out there"

I used to be in abundance mindset but something messed it up

There’s this fb I got attached to somehow cause she was the only one for quite a long time and biology did it’s thing.

I don’t particularly have oneitis for her it’s just that I’ve known recently that she been fucking around w a friend of mine and maybe I put this fb on a high horse and now I’m shattered to realise what she’s really doing ( messing Around )

And she been avoiding me lately because I’ve started with a new plate. Fb is jealous or sth.

Now a lot of thoughts of my day revolve around her and the funny thing is my new plate is way hotter than her but knowing that I’m not gonna fuck this fb anytime soon since she in her supposedly hoe phase makes me want her more ( you want something you can’t get type feeing )

I get quite good iois around college from better girls even but this one is not getting out of my head for some reason.

In spite of all the facts that there are better girls out there and I’ve got a way better chance at them I just can’t seem to get this new belief into my head.

Im gonna hookup w the plate soon and maybe that’ll help getting over this fb but to bring back my old sanity what would yall suggest I do.

What actions can I take to get the perspective and get out of my head so that all this is a funny thing in the past.

The thing is i am bothered only when I start focusing on my studies. Rest of the day I dont really give too many fucks.

Maybe my monkey brain is trying to avoid studies by taking this whole situation as an excuse to analyse about