How to fall out of love after 3 years

In september we would have had our 4th anniversary.

I still think about it even though he seemes to only be interested in friendship, which is just impossible for me. I agree to it, only because I hope that he will like me again, but it´s so draining and I can´t seem to lose hope.

Back then he broke up with me, didn´t give me a reason back then. After a week we met up and talked, he agreed to give us a chance when the time was right. So i waited, and waited and after 9 months he told me, he only promised it, because he didn´t want me to be sad.

It took some years until he told me, that he just fell out of love and he also had a bad gut feeling about our relationship, but claimed that I was a really good girlfriend.

We never had a fight, we had problems ofc (communication, but we worked on it) so the break up was very sudden to me, especially because I tried to be a good gf.

Sometimes I wished he had a different reason, maybe if he cheated on me it would be easier for me to let him go, but I know he´s not that type of person.

So for 3 years I tried, and hoped, and I saw him everyday at class and it is the worst. He says wants to be my friend, but I will alyways be his ex no matter what.

In between these 3 years my grades went from A´s to C´s , I tried new sports, gym, hobbies and spending more time with friends, but it didn´t seem to work. I now work 2 jobs in hope that it might make it impossible to think of him, but it still looks like my situation doesn´t improve.

I also went to therapy for aroung 4 years (I started 1 year before our break up for other reasons) and I hated it, because we only talked about my interactions with him, but not about what I should/could do to let go.

My friends tell me ,,Just let go´´ but how? Does anyone pls help me? Sry for so much input, but my life just isn´t the same anymore. I wanna enjoy my old hobbies just like before the relationship, I don´t wanna wait all day on my phone and wait for a message.

Also I tried no contact for around 4 months, but it´s nearly impossible if you have same classes, group work etc where you even have to meet at home.

I hope this post is not too long