In fact, the affection Lu Bai harbored for Yu Xi has always been very weak, not as vigorous and intense as he believed it to be.
It was just that Yu Xi was the first person he may have perceived in a romantic light, and she did do some rather excessive and outrageous things to him, so...
So this kind of emotion that he was experiencing at the moment is called possessiveness, not actually like. Everything that he had undergone before was merely a momentary heartbeat. Be that as it may, Lu Bai himself, who is inexperienced in the department of love, assumed that what he was feeling at the moment was because of his liking for Yu Xi.
If the young man had understood what emotion he was truly feeling inside, he may not be as tangled as he is now. He may simply sulk for a short while before his feelings turn to calm.