"Love" can mean many different things, but the "Christian love" that Jesus talked about means treating others with kindness and respect and helping them when they need it. It is the kind of love we do instead of the kind of love we feel.
"Love your neighbor as yourself" was part of the Old Testament Law (Leviticus 19:18) that was sacred to Jesus' kinfolk, the Jews. But, many people thought a "neighbor" meant only their fellow Jews. One day a lawyer asked Jesus, "And just who is my neighbor?" Jesus told the Parable of The Good Samaritan to answer his question in a way we can never forget:
A Jewish man was taking a trip alone and was attacked by robbers. They beat him, robbed him of everything he had, and left him nearly dead beside the road. After while, a Jewish priest came along and saw the poor man lying beside the road. As a religious man, you would expect him to stop and do what he could to help. But, instead, he kept going and pretended he did not see. Later, a Levite came along. Levites were assistants to the priests, so you would expect him to stop and help, too. But, he did just like the priest and kept on going.
The Good Samaritan bandaged the man's wounds, put him on his own donkey and took him to an inn.
You would expect the Samaritan man to be the one who just passed by without helping. Instead, this Samaritan man took pity on the injured Jewish man. He bandaged his wounds. He put him on his own donkey and took him to an inn where he could be safe and recover. Since the injured man had been robbed of everything he had, the Samaritan man even paid his bill at the inn and paid the innkeeper to take good care of him!
After telling this story, Jesus turned to the lawyer who had asked, "And who is my neighbor?" and said to him, "Now which of the three men that passed by was a neighbor to the injured man?" The lawyer was forced to admit that it was the Samaritan who treated the injured man as a neighbor, not his fellow Jews who did nothing to help. Jesus then said, "Yes, now go and do the same!"
To learn more: Matthew 5:43-48, Matthew 22:34-39, Mark 12:28-31, Galatians 5:14, James 2:8-9, 2:14-17.