started a new relationship 2 months ago. everything going great but he told me out of the blue in conversation his ex wife calls him everyday, they were together 10 years but split up 4 years ago after a very nasty break up...he doesn't think there is anything strange about this as he says they are now friends and there is nothing else going on between them, his ex has been with her partner since they split up .... he seems to befriends with a lot of his ex partners - am i being unreasonable to be upset andbothered by this?