how does Christ love us?

Deeply and unconditionally. Without expecting anything in return. Individually, not collectively. If we love Him back, we will show it by keeping his commandments. But God commendeth his love toward us, in that, while we were yet sinners, Christ died for us. His love for us is a free gift that He willingly offers us, but we have to do something about. We have to act and allow it to work in us, act on it and be changed.
Greater love hath no man than this, that a man lay down his life for his friends. We are his friends, if we do whatsoever he commands us.
Because He loves us, He wants us to be truly happy, and He knows the only way to receive true happiness is from the Father through Him. He points back to God, always. He glorifies God. He is not proud or boastful or self-centered. He places higher value on us than himself. He put us above Himself - even though we do not deserve it! And he did it because he loves us. He loves us despite our rejection of him. He doesn't need us to love him - he loved us first! We need to love Him. He wants us to love him so that we can be happy. He was willing to sacrifice everything, just to give us the chance, the opportunity for happiness.
He is patient with our faults. He knows we are trying. His influence will bring us closer to the Father. He helps us reach this higher ground. He is never content with what we think is our best - He has better things in mind for us. He will never rest until we are safely home again. He will never give up on us. He cares about us and suffers with us. He mourns with us and rejoices with us.
There is nothing we could do to make Him stop loving us - he always will. He will protect and defend us. He is always there. He wants us to rely on Him. He fights for us. He gives us little blessings to brighten our day :) He has eternal hope for us. He bled and died for the sinner and the saint. His love is offered to everyone - the difference is who will take it and make something of it. He even loves the people who hate Him and do terrible things to Him. And he never, ever gives up on them either. His love has a purifying, perfecting effect. It is cleansing. It makes us want to be better people. It helps us to become better. It is constant. It improves our life. I should love people this same way - deeply and unconditionally. Love = service and sacrifice.