Since Paul didn't expand on this, the best we can do is to review what noted theologians have said about this. To get some good answers, you really need to look no further than Bible commentaries.
Bear in mind that the type of love here is agape love, which is also translated as charity, or selfless love. It's not speaking of romantic love as on "love is blind", it's speaking of the selfless love that puts others first.
The general consensus is that it means that if you are truly charitable, you will have the type of love trusts by default. That you're not cynical by nature.
