Did I lose meaning to my life?

Hello, I am 21 years old and I am studying engineering, it all started when I was 16 years old and I fell madly in love and she also (supposedly) fell in love with me, a few months later she left me for my best friend, it destroyed me, I went to 4 psychologists and my obsession with her did not stop, the last psychologist told me that one day I should vent to her about everything that happened, and after that she started talking to me and I couldn't stop feeling anything and I started hanging out with her, despite all the prejudices for hanging out with my friend's ex, because no one knew the story behind it, I lost all my friends but I was very happy because I was finally with her, that was in my last year of high school, and I postponed going to university next year, (because I'm a foreigner), to be with her and "build" a relationship because I thought it was going to be forever and it was worth it, since we started dating we talked about living together when she comes to study and IT WAS TOO MUCH excited about it, everything was perfect, but last week she said that she was going to stay to study there, and it hurt me a lot and we argued, and after that, she said that she was no longer in love with me, that there were many things, and in the middle of midterms, I went back by bus (600km) to fix things because I didn't want to lose the love of my life, when he arrived, he left me as if nothing had happened, and to this day I am destroyed, and I can't eat, I really thought that he would I was going to marry her and she always told me that we were going to be together forever, literally less than a month ago, I don't know how to continue, it was all my motivation, I want to talk to her but I don't give her the same from one day to the next, I feel like she hates me and I don't stop feeling anything for her, I want to get her back even though I didn't do anything, I really treated her very well, the last month the relationship deteriorated because she hung out with two friends who I really didn't like and the three of them always slept together, and I told her well that I didn't like it, and he treated me as toxic, from then on everything went down.