They're in love with this idea of love
It's a shame that they'll believe it will come
Famous adaptations of love that most girls associate with reality have become so common that it is now the normal idea of love these days. Abel says it’s a shame this is the case, because these girls are just going to be disappointed.
He is may specifically use the term “they” because he wants the girl to know that he is in the same boat she is. He’s not buying this overblown idea of love and companionship.
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