Actually, the OP didn’t ask about homosexuality, either. He/she asked about love and relationships.
As far as I know–but correct me if I’m wrong–two people of the same sex can love each other and be in a relationship and there is nothing wrong via Catholic teaching in that.
The definition of “relationship” is quite broad.
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Actually, the OP did. The TITLE of his/her thread is “WHY is homosexuality immoral?”
The question further of “why can’t homosexual people just love” however, reflected the confused way in which homosexuality and ‘love’ are viewed by many today.
Homosexual inclinations are not in themselves immoral.
HOWEVER, homosexual ‘sexual relations’ ARE immoral.
People can have ‘relationships’ which are ‘sexless’. A chaste relationship between two heterosexual OR homosexual people is not immoral. A sexual relationship between two unmarried heterosexual people, or between two heterosexual people who are not married to each other, or a sexual relationship between two homosexual people, would be immoral.
The fact that a person can ‘love’ another person (and talk about a word whose definition is broad!!) does not mean that the love ‘cancels’ out immorality. A man could worship the ground his mistress walks on, and that doesn’t make his adultery moral. A man could even have his wife’s ‘blessing’ on an adulterous affair --still doesn’t make it moral.
The scandal and confusion exist to a great extent today because people redefine language and use language to mean whatever the hell(and I use that term with intent) they want it to mean.
Thus the poor OP is exposed to a culture in which the definition of love is so broad that it encompasses everything from ‘mother love’ to ‘love of God’ and ‘love of one’s fellow beings’ --all of those terms being positive and ‘moral’ – and then they hear homosexual people saying, “all we want is to LOVE EACH OTHER” and oh golly gee, it sounds as if we are trying to deny them the RIGHT TO LOVE --how horrid!
But the Catholic Church does not deny homosexual people the right to love morally, just as it does not deny heterosexual unmarried people (or even married people) the right to love morally. (And I must reiterate, as it seems this is constantly forgotten, that the Catholic Church **does not make up rules about love or sex or whatever. GOD ‘makes the rules’. The Church, as it has always done, merely reminds people what God’s rules are. . .because every generation always winds up trying to ignore some rules and reinterpret others.)
**God, through His Son, His written word, His Holy Spirit, and the Church He gave to the world, knows what is best for His creation. His ‘rules’ are positive ones that will ensure not only our ‘success’ in living in this world, but our fitness and our ultimate happiness for eternal life in the next. We would do well to ignore the siren song of the Devil (who quotes Scripture and loves to take a good thing like ‘love’ and turn it into an evil idol in the place of true love, and try to trick us into accepting it as the real deal).