Nah, it's way to early to call that and in the interactions we see, he makes every possible chance for his friend. It could be a dangerous situation in the future because the girl seems to be interested but, atm, he seems pretty into his girlfriend. Initially, I thought the issue was that he didn't consider her feelings enough when trying to help his friend, but he did turn them down just to wait for her so I do think he was going about things pretty much the right way.
The only thing I possible could criticize him for was walking 2x2 with the girl and her friend when he had a girlfriend because pairing off like that could lead to misunderstandings
I still think he's starting to cross the line, so much so that the other guy has started to notice " a different vibes " between the two.... and I cannot believe that he has not noticed that they have started to double date. he shouldn't have allowed that to happen. He has a girlfriend, and he's double dating.
he should have been dumped. he and that other girl are getting along great..... pretty soon something will happen, and An and him will break up. I don't believe he's helping.... early on, yes, but not lately and even the friend he's helping has already noticed that the vibes have changed.