My boyfriend was in the icu 3 months ago for pneumonia. he is better but not 100%. what should he avoid and what should he be doing to get better?

Recover from pneumon: Pneumonia still kill a lot yearly, even in the USA where we have the best medications (and best ICUs). When a huge organ filled up with blood get infected, it is like the whole body gets infected. A survivor of such a grave sickness loses tons of proteins (=muscles, antibodies..). Replenish by judicious use of proteins and carbohydrates. It may take him many months to recover.

Depends: This depends on the specifics of 1) if he has an underlying condition that predisposed to the pneumonia ( like a disease that lowers ones immunity) or one that would be adversely affected by having pneumonia ( like asthma) so this really should be addressed by his primary care doctor. Very often after this kind of hospitalization a patient is given discharge instructions, which should be followed.