[they aren't dating, no. but they've done a lot together despite not knowing each other for very long. Lina isn't the type to get possessive, or at least she doesn't think so, but there are a lot of other unknown variables here.]

I don't think so. I can't tell you who to think is cute! [she might as well be honest about it.] If we do end up in anything serious and you still wanna flirt with other people, I won't even look at you funny.

[the size of that if is enormous, of course.]