A major donor to Northwestern University — who says he’s given $7 million to the institution over the years — is no longer supporting his alma mater after it canceled him.

Businessman and entrepreneur Ben Slivka wrote on his personal website that he was rejected by his beloved Northwestern — he “bled purple” for decades — after saying rude things to three students, an allegation he denies. …

He wrote that given “my baffling treatment by NU, I no longer ‘bleed purple’, and my volunteer time and dollars are directed to other more worthy causes. What a shame for current and future NU students and faculty that my 45-year Northwestern connection has ended this way.”