The speaker is Wei Jian, who is in the same class as him. The other two looked familiar, probably from the same psychology department. Now, Wei Jian was mocking him, not because they had a past dispute, but probably just because Ray Kaley was now chatting and laughing with him, causing dissatisfaction on Wei Jian's part.
At the start of the semester, Wei Jian began pursuing her, but until Li himself left school, this guy was still unsuccessful. However, they did become good friends.
To be clear, Ray Kaley treated Wei Jian as a convenient spare tire. This lady, as long as he's a man, she can pretty much joke with him, but taking any advantage of her is extremely difficult.
She belongs to the type who spreads a vast net to catch big fish, waiting for the big fish to come. Once the big fish arrives, she expects to catch a whale. Presumably, at that time, the small fish named Li was in her net, waiting to see if he could grow bigger and fatter.