This is not easy and it's someone's life. You didn't mention if it's you or your partner that wants to end the relationship. You will always be tied to your mate in some way because of the children. Breaking-up even though the couple may be angry at each other they still go through a grieving process and it just takes time. Two people can't live together, share their thoughts, have children and move on so easily. If you could give us a little more information we could answer this question more thoroughly for you.