How she behaves in the next update may give a clearer view of the girlfriend.
Does she continue to hang around this guy during the day, or does she look for another hook-up.
She took the guy to the bedroom and just gave him a blowjob and a facial and the next day she's already calling the guy by his name to her boyfriend and buying lingerie??
I think the GF has been NTRing the MC since before...hehehehehe
And when she's with the guy, she tells her BF that she needs to stop talking to him because the other guy is jealous. After the first time with the guy, she tells her BF that the guy's dick is better (she's never felt so full), and says she needs to go because the guy is going to wake up and she needs to "take care" of him.
Maybe she went on this trip just to be with the other guy?
Knowing that MC couldn't go?