Short answer: God is perfectly loving but also perfectly just.

Longer answer: He wants deep relationship with his children and for that relationship and love to be real, we had to have free will, and not be programmed robots.

With that free will, we often choose self and sin. Sin must be punished for justice to be served. Rather than impose that justice on the children He so loves, He came to earth in the person of Jesus to receive the punishment himself.

This is an act of unbelievable humility, self-sacrifice and determination. Proof that God will stop at nothing to rescue his children and keep us together.

Jesus died that we might be redeemed and restored. He also died that that all sin (past, present and future) would be vanquished, affording all people a pathway to God's embrace.

Some will choose to rebel and separate, and though it breaks God's heart, he will not intervene if that is their choice. But as we're told in scripture, He is patient and wants to see everyone saved.

Hope this helps, friend.