It puts up with everything. Only love can bear with things as they actually are. It doesn't whine about the good old days, or the way things ought to be. Love covers a multitude of sins. This is how love can reach out beyond all barriers, even to the very margins of society, to the criminal in prison, to the gangster on the street corner, to those imprisoned by sexual sin or drugs, even to those who openly hate Christ and His Church.
Love bears all things.
Love knows that in the end, it will be vindicated by the One who is perfect love. This is viewed as foolishness by the unbelieving world. But to believe all things is the only way that love can be completely free to love without conditions, without limits, without distinctions. The future is bright because the past is forgiven. Love endures suffering, hardship, persecution - all for the sake of the beloved.