what is this?

unstable: anxious because of the inability to get what one wants

instability: the state of anxiety caused by the inability to get what one wants

let's see; what have we got here

which (of three or more) / which one /

Nothing

what

Used when something comes to mind: to recall / Used to express agreement: yeah, of course

(chiefly in the negative) so much; so often; so long; particularly; especially

(colloquial) current boyfriend