strung out

strung out  {adj.},  {slang},  {colloquial}

1. Nervous, jittery, jumpy; generally ill because of drug use or withdrawal symptoms.

The only explanation I can think of for Max's behavior is that he must be strung out.

2. To suffer because of a lack of something previously accustomed to, such as the love and affection of someone.

Sue is all strung out for Jim; they've just split up.

Compare: SPACED OUT.