You can tell her your most shameful secrets and know that they will go no further. She buys the best, most thoughtful gifts that you didn’t even realise you wanted until you receive them. She knows her own mind and respects your opinion and a difference of views is a good point of discussion and not the start of an argument. She doesn’t get jealous when you work with a pretty colleague or meet a female friend for drinks because she trusts you totally. She doesn’t just support your career, she takes an interest in it.