With how I understood.. I think he was talking about the question that Nana asked (the one about If he would kiss anyone while being in the same situation as they were back at the moment).
Hoping I understood right and got the part u were asking about!
ML said “again” so he did kiss others before?
I don't know but I think it was implied that he could kiss another person but wouldn't
I think he meant that if mitsu wanted, he [nana] could pretend they were normal friends again, but even if he could pretend to, he didn't want to do it again [first time being in school].
Sorry you two, I’m a complete idiot
Don't be sorry, it's okay ^^
In chapter 4: What does ML mean by: “Even if I could, I’d never do something like that again.”