He still loves Stephanie quite a lot. Just like Vincent, he was very worried about her, nevertheless, he can't make his worries as visible as Vincent is doing since he is Stephanie's fiance while he is a mere friend.
Vincent is the one she ended up choosing and since Vincent is his beloved elder brother whom he loves very much he decided to withdraw when he learns about their relationship on the night they got engaged.
"Father's birthday party is just two days away. She promised that she would try her best to come. I will decide on whether or not to travel there if she doesn't show up," Vincent said as he picked up the glass of whiskey from the black table.
"That is a very wise decision to make. Whatever will end up being your final decision always remember that I have got your back," Gabriel said as he gave him a reassuring smile.