Calvinists teach that God predetermines who will go to heaven forever and who will go to hell forever. The matter was settled before God created humanity.
As you can imagine, it's difficult, nay, IMPOSSIBLE, for Calvinists to offer any legitimate explanation of God's love for those He chose to create and condemn to the Christian hell forever AND ever. But, the Calvinist must give it a go because the Scriptures teach clearly that God loves all people. They fail.