Love. . .never ends. Christian love is a work of the Spirit.

Love is greatly important. Love takes work, humility, and it hurts. But it reflects God and that is a remarkable thing.
True love as described in I Corinthians 13 is a work only done in a person's heart by the Holy Spirit. You cannot make yourself love like that, not in a million years. The flesh wants, the flesh focuses on self, the flesh retaliates, reviles, mocks, and scorns.
True love has nothing to prove and it has an attitude of self-denial. In a manner of speaking, it has absolutely nothing to gain. The soul who is saturated in Christ has nothing to gain and nothing to lose by loving. If you look at that passage and think, "Okay, so what would hinder me from truly loving?" then you can learn a lot from the reverse.
Envy.
Boasting.
Arrogance.
Disbelief.
Etc.
What causes this attitude instead of a heart overflowing with Christian love? Pride. A focus on self. Sometimes a gross misunderstanding of the truth about who God is and how he loves. Insecurity lashes out in boasting. Disontent produces envy at times. A heart that is set on self and has not found delighting in Christ and finding security in him will not love the way it should.
We do not have the power to make ourselves love like this if we just "try hard enough." We must rely on the grace of God. Through him we have a constant supply of power (Eph 1:19-21).

Consider these verses from I John 4:

8The one who does not love does not know God, for God is love.
9By this the love of God was manifested in us, that God has sent His only begotten Son into the world so that we might live through Him.
10 In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins.
11 Beloved, if God so loved us, we also ought to love one another.
12 No one has seen God at any time; if we love one another, God abides in us, and His love is perfected in us.
13 By this we know that we abide in Him and He in us, because He has given us of His Spirit.
16 We have come to know and have believed the love which God has for us God is love, and the one who abides in love abides in God, and God abides in him.
19 We love, because He first loved us.
20 If someone says, "I love God," and hates his brother, he is a liar; for the one who does not love his brother whom he has seen, cannot love God whom he has not seen.
And this:
John 13:35 By this all people will know that you are my disciples, if you have love for one another.

Now, these verses spoke of loving other Christians, but we also need to love unbelievers as well. We were unbelievers once too!

Saturate yourself in the true knowledge of God's incredible love for us. In Who He is and in What He's done. Then ask God for the I Corinthians 13 love for us. Look at what Paul says in the first verses about if he doesn't have love then he is nothing. Just look. It's rather sobering.