My DH has a very close female friend, they work together, have for years. She is quite a lot older than him and he says he’s not attracted to her (I believe him). However they do have long phone calls, meet up for walks/coffee, she sends him texts with multiple kisses on, etc. I have often felt he confides in her much more than in me. Is this an emotional affair, or simply a friendship? And what is the difference in general?