What's his problem

I wanna know why the little twink threw a fit and stormed out like he caught his lover cheating on him. Wasn't he the one who ran to Mok begging for the three way because sex with Nanjo was too vanilla, too boring. Wasn't he also the one who admitted that the only reason he was with Nanjo was because he was rich and good looking, so why the drama now. Yeah. Mok doesn't have the best personality or history of treating his partner's with respect etc..but there's something about Nanjo that's making him act outside of his regular "playboy jerk" persona. I think he might actually be experiencing real emotions for the first time, of course he's gonna fuck it up by going about it the wrong way, but he's had no experience with being "real" with someone else. I'm rooting for them, if anyone can turn him into something resembling a real "boyfriend", "lover" or whatever he needs to be to grow up, it's Nanjo.