you did not love him.
he was cold ang grumpy at least half the time
his being aound meant you could go on holiday on your own
you had three kids aged 6,5,2
you liked is family and they liked you
your kids love him (he is their dad)
life would be hard day to day withou him around.
you had not made love in over a year and dont want to
you see no prospect of the relationship getting better.
its the kids tht keep you together