It isn’t for the weak. Anger, frustration, pain, sadness, patience are all part of love too. If you can endure all of this and become stronger together, you’ll make it. If you don’t have the ability to work together or the mental capacity to endure it, then don’t be surprised when the relationship fails. If that is that case, you can’t blame love. Love is pure. It is the faults of human nature that cause failure.