The main complaint I have with all yuri manga is that instead of writing drama they just make everyone cheat and sleep around. I really hope this doesn't become like that because the constant "I'm not good enough" stuff is dragging it down enough
Honestly, ive been reading GL manga for quite few yrs and theres plenty of stories where "messing around" is not part of the plot, the majority of it really.
Tho i must say, when u consider manhwa/manhua, then yes, sleeping around is quite common. But in hindsight, they try to depict the reality which in some cases can be that messy, but since generally is not from experience of the author it ends up being shallow or too messy.
We're only 3 ch in here, so a bit early to worry about that, mostly when theres no actual sign it will be messy. More like a trigger for development bringing an old flame/pseudo rival to the plot.