Wow, this is an interesting question.
Firstly I must say that the concept of love is misunderstood by many people.
Am gonna answer this question based on my belief as a Christian.
There are different kinds of love that exists and most people who don't know this get into deep mess alot.
There are four types of love am gonna list and all means different thing in the original Greek;
1)Eros - this love have to do with romance and sexual love
2)philia-friendship love for a friend
3)storge- brotherly love
4) agape- unconditional love
There are others but just to mention but a few.
Well my focus is gonna be agape love which is the God kind of love.
According to the Bible God is love (agape) which means unconditional.
God's love for us is unconditional, without constraints.
The only way you can have and function in this kind of love is first to receive Jesus Christ into your life and you become a new creation and your inside is transform.
The man that have received Christ is Born of God and have the nature of God which is love.
God is love (agape) personified.
And also there is what we called a walk of love where you consciously start walking towards loving someone because you already have the nature of God in your spirit.
Here are some scriptures from the Bible about God's love (agape)
1 John 4:7 Beloved, let us love one another: for love is of God; and every one that loveth is born of God, and knoweth God. 4:8 He that loveth not knoweth not God; for God is love. 4:9 In this was manifested the love of God toward us, because that God sent his only begotten Son into the world, that we might live through him. 4:10 Herein is love, not that we loved God, but that he loved us, and sent his Son to be the propitiation for our sins. 4:11 Beloved, if God so loved us, we ought also to love one another. 4:16 And we have known and believed the love that God hath to us. God is love; and he that dwelleth in love dwelleth in God, and God in him.
So the only way you can show someone unconditional love which is the God kind of love is receiving Christ into your life so you can receive eternal life into your spirit and also have the nature of God in you.