A failed relation is a big burden. However, many people still linger on only due to the pain of suffering owing to a breakup. However, the question that such people should ask themselves is the fact that being in a sucking relationship would suit them in long run.
The answer would be a big No. It is better to get out from a failed relationship rather than continue and hope for things to improve. Relationships tend to come to the breaking point due to some reasons. It would always be better to break off from failed relations and ponder on the reasons rather than sticking to the same.

Breaking from a failed relation will also give you the option of exploring new friendship and finding a person who suits your personality better than the one with whom you would have broken off with. Breaking off from a failed relation will also give the other person the freedom to choose a life of their liking and you would be doing a great service to them by breaking free from such a relation.
If you are still stuck in a failed relation, the time has come to break free from such a relation and find new vistas of opportunities where some like-minded person might be waiting for you.