Biggest betrayal of my life

I'm facing the biggest betrayal in my whole life.

I loved a person for 4 years nearly(since 2022), from one side cuz firstly it was secret and cuz i was ugly by the time and that person is so perfect that he was out of my league. I didn't see or talk to him for 3 years.

Then in June 2025 i was seriously depressed from missing him to the point i nearly ruined my whole school year and missed my opportunity to go the school of excellent student (the best school in our country)

Then somehow i did a VERY BIG AND SMART PLAN to the point we became together for nearly 4 months.

One day we had a little misunderstanding and he blocked me. My bestfriend and classmate saw me crying, screaming and har/ming myself, and my health state became terrible.

She promised me she'll help but ended up‼️‼️‼️

Telling him some lies i said, whenever he asks if he should get back with me she says no,whenever he asks how i'm i doing she says VERY FINE even if she saw that i wasn't even able to leave my bed for 2 weeks, and i got a a chronic stomach disease called irritable bowel syndrome I think (one of the reasons is terrible mental health)

Worst part is that i'm sure 99% they are together now, from a love note he posted and tagged her in it. During the weeks where i wasn't even able to leave bed they got to know each other and develop feelings.

How on earth! Ur friend of years who sacrificed everything for you and that u promised her is dying, and you are flirting with the love of her life and ruining their relationship.

I don't care about him as much as I care about her.

Yesterday we were talking about smtng similar and she was swearing that from the second her friend tells her she has crush on someone for 2 seconds she won't even look at him again.

When i asked her why are they talking even if the reason they started talking about is ended and asked her to block him and she started gaslighting me and telling me he asks her about me everyday and he is still thinking about me etc.

I'm dying actually. My mental health is 0, me health is ruined. My school year is also ruined.

How can i get out of this situation. Is there any solution i do about them, or at least how can i heal??