There is no tried and true ending to a relationship that isn't working out. We all get those; they happen to everyone. It's sad, there's pain... it sucks, but it's natural. In truth, you have to really ask yourself a couple of questions:
Is this the type of pain that we, as a couple can get over?
Is this situation truly something I want to continue being in?
In the end, someone or both of the people will get hurt. If it's truly time to move on, listen to your heart and make that decision. It's better to deal with that hurt and sever the ties rather than possibly remain in that relationship that may not get better. To tweak a Tyler Perry line that has stayed with me, "Sometimes, we stay in relationships that everything and anything is the world is trying to tell us to break away from."
In the end, it's a tough decision, but it is one you must make on your own. I wish you the best of luck, Silas; but I'll end it on this: at the end of the day, you have to love yourself more and realize which is the best situation for you.