It is a question of what is purposed for the Unbelieving mate you/someone known to you, have dated/married, or see potential to date/marry. Many are the view points to unravel, for this interlude however, it is aluded that the unbeliever should not be dejected, because God's love is theirs, as it is yours, to be expressed. For God so loved the 'world' (not, 'only the believer') [John 3:16] ... as we know it.. The trajectory is, ' that whoever believes in him shall not perish'. If nothing can separate him/her from God's love, how would you? (Rom 8 from v31) As you may accord an Unbelieving family member I'd imagine?! Do not view others in contempt ( Luke 18:9) lest you be self righteous (Levi 19:18).