Alheia means 'oblivious' or 'unaware' and is a less common, more poetic word than its synonyms. It implies a state of being detached or indifferent to one's surroundings.
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Jorge Vercillo's "Distante" is a beautiful, heartfelt song about the pain of separation and the deep connection that transcends physical distance. The singer feels completely lost without his loved one, expressing, "Se você não está aqui Tampouco estou junto de mim" (If you are not here Neither am I with myself). It's as if his very being is tied to hers.
He imagines himself as the elements around her, saying, "Sou o vento que lhe envolve Sou a noite a lhe abraçar" (I am the wind that surrounds you I am the night embracing you), showing how much he wants to be close. But the most poignant part is his fear of her moving on, repeating, "Só não quero imaginar Você vivendo outros amores por aí" (I just don't want to imagine You living other loves out there). It's a raw and honest look at the insecurity that comes with distance in a relationship.