I have never missed my EX, but have 'needed' him on occasion.
Like when my Dad was terminally ill, and my Mum was suddenly taken seriously ill (dying 10 days later)...I needed him to be there for his children, who were 12, 14 and 16 at the time, and to show some sort of support to me and them at a terribly traumatic time!
And when our youngest son was on life support at 20 yrs old (heart failure due to undetected arrythmia), I needed him to care enough to at least phone the hospital to see if he was ok, or even, God forbid, turn up and sit at his bedside for a while, like his parents did. (DS thankfully survived and is about to become a Dad for the 2nd time)!
And when his Father had a heart attack, followed by a triple bypass and valve repair, which meant 7 weeks in hospital.....I needed him to occasionally offer to take his Mum down there in the afternoons, so I could do a full days work, or even to visit his Dad more than twice, and for more than half an hour!
And I need him to care that he has 4 (nearly 5) beautiful grandchildren, 3 of whom don't have any other living Grandad, and maybe, just maybe, send them a Birthday or Christmas card...but then he hasn't for his sons, so think that's pushing my luck!
And that, dear friends, is why I have been happily divorced/single since 1990!
Because, when all is said and done, I don't need a low-life like that, and neither do the rest of his family; parents, brother, children and grandchildren....we are doing just fine, and he is going to be a very sad, bitter, lonely old man.....couldn't happen to a more deserving person!