Several thoughts occurred to me in reading this forum.
The first is the question of SSA. There seems to some that the determination of whether one is homosexual versus heterosexual happens after engaging in the sex act. How strange is that line of thinking? If that were true, a person would have sexual encounters with a male and then a female and then sit back, compare the encounters and decide, “Well…I truly didn’t care for the act with the man, but the one with the female was great! So that’s my sexual orientation!”
Now that is just silly. A person KNOWS his or her sexual orientation long before having sex. (This is in normal encounters, not forced acts or pedophile acts, etc) and persons who are truly bisexual know that as well. The idea that I, as a woman, can look at another woman and think how sexually attractive she is does not make me a lesbian. I am simply seeing how beautiful she is and desirable she appears to men. It does not mean I want to have sex with her!
Now, another thought is the question of what is a person to do about his or her sexual attraction. If it is SSA, and the person is a faith filled person who believes in the truth of God and Jesus Christ, the person will not act upon the sexual desires, since the homosexual act is sinful. The PERSON is not sinful, but the ACT is sinful. Just as feeling attraction toward sexual activity with a child is not the sin, the acting upon the desire is the sin. “God does not make mistakes.” No - He does not. A Down Syndrome child is not a “mistake”. Ask any parent of that child.
The question was raised, well, then, should a homosexual/lesbian person live a life denied of sexual fulfillment? Yes. If they are Christians, they will. Sex is not “necessary” to live, as needing food, water or shelter are. The question was asked if there are heterosexual persons who are demanded to live without sex, as denial of sexual relationships is somehow seen as necessary. Yes, there are many heterosexuals who live without sex. Never. Ever. Virgins. How about priests, Brothers, Sisters, Friars, hermits and (wow—imagine this!) a chaste, virginal adult who has either chosen to live that way or has simply not found another person with whom they want to marry?
Lastly, should the OP be celebrating the same-sex relationship of the friend? Should we be happy when our friends are happy?
No one should be happy that another person is living in a sinful manner. No one should celebrate an act that is sinful even if it somehow satisfies that person’s desires. If I am diabetic, but eating cake makes me happy, who will celebrate and be happy for me? No one! … Why not? Cake makes me “happy” (fulfills my desire). It is because everyone knows if I keep eating cake, I will die! No one wants me to die out of fulfilling my “desires”. Can I be “happy” in life without ever, ever eating cake? Sure I can! Yes, cake is tasty, but I don’t need it to survive. Plenty of people besides just diabetics choose to never, ever eat cake.
Therefore, I want my friend to be happy and I want to celebrate when she is happy, but not if she is doing something I know will kill her. Homosexual acts will kill her soul by damning it to hell.
Now, please don’t go off on how I should not “judge” another, that the Bible says, “judge not, lest you be judged”. When you quote that verse, it does not take into account what Jesus was really saying about judging. If you read the rest of that Biblical text, you will read that Jesus is telling you that you should be careful that you will also be judged by the same “yardstick” so to speak. In other words, we judge others by God’s Laws…judge another when it is an action sinful to God, because we all are here to help each other get to Heaven!
I apologize for the long post, but I wanted to make all my points while they were fresh in my mind. My take on what the OP asks is therefore, she should NOT be “celebrating” that the friend is in a sinful relationship, even though it appears to be making her “happy”.