I don't think you really seem to know very much about homosexual relationships, or heterosexual relationships for that matter.
The genders of two people in a relationship do not contribute to how the relationship is. A heterosexual relationship can be destructive, so can a homosexual relationship.
I don't think it would be accurate to say that a homosexual relationship necessarily has no love in it, harms the people in it emotionally, physically, and spiritually since you are (I assume) heterosexual and have never been in a homosexual relationship. I'm guessing you've only seen portrayals of them and have heard things of them that have led you to believe those things to be fact, but I can say, as a person who is gay themselves and is currently in a relationship, that it's not fact.
My relationship is the furthest thing from destructive. I've never been around someone who makes me so happy and supports me, and it doesn't matter to me that they're a girl. You may view it as sinful for that one factor of the relationship, and that's fine. I'm not here to change anyone's views. But at least know that two people of the same gender can be in a relationship and be happy just like everyone else.
It doesn't matter that two people are of the same gender or opposite gender, they can be happy too.
But, according to you, I suppose it doesn't change the fact that sex between two people of the same gender or between unmarried people is wrong.