Dean McDermott now admits he has some big personal problems ... so he's checked himself into rehab.
A remorseful McDermott seems to be addressing reports that he cheated on Tori Spelling, saying, "I am truly sorry for the mistakes I have made and for the pain I've caused my family."
Dean kind of mysteriously adds, he's dealing with "some health and personal issues."
Dean says he's getting help ... so he can become the husband and father his family deserves.
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