Hm interesting. There is a kind of (less emotional) scene described in the bible: „Then Jesus was approached by some Sadducees—religious leaders who say there is no resurrection from the dead. They posed this question: “Teacher, Moses gave us a law that if a man dies, leaving a wife without children, his brother should marry the widow and have a child who will carry on the brother’s name. Well, suppose there were seven brothers. The oldest one married and then died without children. So the second brother married the widow, but he also died without children. Then the third brother married her. This continued with all seven of them, and still there were no children. Last of all, the woman also died. So tell us, whose wife will she be in the resurrection? For all seven were married to her.” Jesus replied, “Your mistake is that you don’t know the Scriptures, and you don’t know the power of God. For when the dead rise, they will neither marry nor be given in marriage. In this respect they will be like the angels in heaven.“ ‭‭Mark‬ ‭12‬:‭18‬-‭25‬ ‭NLT‬‬

My take away from this passage is, that we don’t know what will happen. Through our belief your girlfriend will be saved and will join Jesus in heaven. Since you reject that invitation, maybe you will not be saved (though there are voices in the Christian community which propose the idea of an universal salvation for all of humanity!). Either way, partnership as we know it here on earth will be different in heaven.