What if you never really had much in common with them in the first place, it's a chore to see them, they irritate you with their competitiveness which masks their insecurities, their dh is a complete tosspot and you feel compelled to shout like Pete off BB everytime their dh's name is mentioned
BUT
their insecurities make you feel awful for them, you know what they must have to put up with married to that w*er, they don't really have many other friends at all and they are lonely?
Is phasing it out by decreasing the contact a humane thing to do? If you were shagging that person you could just pack them in... 'It's just not working for me anymore'.... 'It's not you, it's me'.... 'You deserve better'..... etc.