Love endures all. We understand it from the grammatical aspect and even the presumed definition that it last forever. Well in the simplest form that is true. What we fail to realize is that love endures through rage, anger, disappointment, grief, all the good times and even the most extreme bad times. Think about it. If you are a parent and your child goes astray or off course to the point your heart breaks, or your are so disappointed or angry, while you may not like the behavior or removal from the home to a place were your child can receive help. However, you always love them but not the behavior.
Well, God does that with us. He loves us through good and bad no matter what. If we ask for forgiveness He is willing to accept it. More importantly, He throws it as far from the East and West as possible, and forgets it. He does not hold grudges like we humans do.
So ideally we are called to do the same. But since were not God we don't do the forgiveness thing as easily as He does. Sometimes we hold on to our anger with both fists clenched tight just so we can find the fuel to go on another day. Eventually lightening strikes us (not physically) and on some level we begin to understand the principal of forgiveness. Which in turn leads us down the path of love.
So no matter what we feel about someone or some circumstances while it is going on or all said and done love endures all.