Honestly I don't see a good excuse for Conte's resignation, even if the board broke their promises he shouldn't have resigned now because he just fucked the club and the fans for possibly years to come, he should have quit earlier or simply should have waited till May.
Now we risk losing our best players, all our transfers collapsed and won't have an adequate replacement for next season which will make things worse for the players, the only way I see it is that Conte fucked us over, I am not defending the board but I just believe Conte Should have put the Club and the fans before his ego.