Breaking up is hard to do, but sometimes it's long overdue. Now is the time to call it quits, you'll feel so much better afterward. Just remember to keep a clear head. No matter how good it's going to feel to make a clean break, remember to keep it clean. There's no point in flying off the handle and making a big violent show of things, if words haven't worked to change things for the better up to this point, no amount of shouting them is going to work now.