Four years ago, after years of fighting in Northern Ireland, an agreement to try and make the country peaceful was signed by the Unionists and the Republicans.
A special government called the Northern Ireland assembly was set up at Stormont.
Here politicians from both sides could work together to control how things in the region were run.
One party accused of spying
Now the political parties have fallen out after members of one of them - Sinn Fein - were accused of stealing secret information to give to the terrorist group the IRA.
Sinn Fein say they haven't done anything wrong but the other parties don't believe them and won't sit down with them in government because of it.
It's not known when the Northern Ireland Assembly will resume its work - but it could be months away.