I used to like a girl. She lied to me that she was not in a relationship but then suddenly she tells me she is taken. In a relationship with a person I dislike a lot.

She used to treat me good for some time. This lead to me being attached to her. We were very good friends.

But now that high school is over, she treats me almost like a stranger, but I still treat her nice thinking that eventually she'll come around like the old times. But I know she won't unless I come meet her with 6 pack abs and a ripped body.

I used to help her a lot with studies.

Was I used? How do I let go?(I think about the old times)

This shit is killing me from the inside. I know she's cancerous for me but I can't help it :(

I'm 17M