First, I need to state the ideas I can't prove. I accept that the ancient book we call the Bible is true. Second, I accept that a personal creative being outside nature exists. Genesis 1:1 is most easily translated "In the beginning God created . . ." God existed before any other thing we can know or experience. By His desire and power he created everything. I have opinions on how, but that will unnecessarily side track us. God who made everything chose to invest extra meaning in His final creature, humans. In Genesis 1:26-28, Gods plans out loud to make humans male and female and in His Image.
I observe that this man and woman are placed in a different situation. A moral choice was placed before them. In the tree of the knowledge of good and evil, God placed a moral test in the center of the garden. I find two parts in this moral choice. Part one: God as the Creator has the right to declare anything in or out of bounds. It is immoral to cross God's boundary, because He said so. It is moral to live inside God's boundary, because he said so.
Part two: it is dangerous to cross God's moral boundaries. God told the male, "If you eat from this tree, you will die." The first couple had little way to comprehend what death meant. The only way I can see that they might come close is through opposites. "We enjoy life. Life is beauty, comfort, and all we could want physically. Perhaps death is the opposite of all this goodness, joy and beauty we see." But what that world could look like was neigh on impossible to imagine.
In Matthew 19, Jesus states that marriage was made by God for one man and one woman for life. Romans 1 talks about homosexual behavior as a result of rejecting God and walking away from him by humans. I don't know why God has made this ruling. I would understand this like the tree in the garden. Though I can't explain God's motives, I choose to trust them. Crossing God's moral fences is dangerous. This ruling encourages dangerous behavior.
If any would ask me my opinion of homosexual marriage or union, I would reply, "I see it as morally dangerous." I can't do any different from my worldview that God is Creator and righteous or perfectly moral.
I can't answer the question of loving feelings toward another person. For me feelings are tricky. They rise and ebb and trip me up as often as not. In matters of the heart, I can't trust my feelings near as much as I can trust God.
That's the worldview in which I live.