So can anyone explain ch5 ,who was the one he ended up with?

I think the main character just ended up having a one night stand with his close friend co-worker, and that his friend didnt find it serious. but the cute co-worker wants something more serious and actually wants to date the main character.

the main character likes both of them though, from what I see. Although I think his interest is in the beginning stages so it's not clear who he likes more.