Yakyakyakophobia

I was talking to an old friend of mind yesterday and the day before and the day before and the day before for the last 30 plus years he very rarely misses a day and rings my phone 3,4,sometimes 5 or more times a day its as if he needs someone to hold his hand i know he's not playing with a full deck of cards but this is driving me crazy.He does'nt know how to take no or stopping calling me so much for a responce he babbles on and on about nothing worth listen to.I beleave what he has is called yakyakyakophibia or better know as running of the mouth.He latched on to me just after high school and i have'nt been able to shake him loose,and its not for a lack of tring.Any ideas out there?