Really need some good love advice!?

well where do i start basically me n my ex fell in love and we were really close and serious he wanted to marry me after his law degree.Bt on my bday he went hospital and i ddnt know and i was relli upset dat i fout hed forgotten.I did his hedin n he broke up wivme.I was obv relli upset n den he sed hed make it all upto me.We spent a few months together bt we werent offically together.I waited for him to make it up.When the time came he said he ddnt wana b togever nemore bt jus best mates.I tried that bt then he flirted with me alot.It hurt to have him bt obv not have him as my bf,so i said i want to forget you.He said ok.We didnt talk for a month i waited for him.N i cnt eat or sleep agen.Ive tried to get him back bt he doesnt want to now.I dont get it he said he loved me a lil while ago and that he dont want to hurt me.i asked his mate for advice about it n my ex got angry.My ex told me to delete his number n we cant b friends.I thnk i wasnt patient enuff and i really want him bak!Actually i got all a* in my GCSE and ive got AAB in my a levels so i have pretty good brain!People dont really think about spelling when theyre heartbroken mate lol

COPE he is not woth it I swear.