my best friend's lover is infected with HIV (from her parents) wat shuld he do??

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my best friend loved a girl sincerely.....he cant live without her even she loves him very much. they both are about to be settled and lead a happy life.their love is 2 years old and both are happy. just a month back, we heard the deadly news that she is effected with HIV and her father died of it the same day.she is mentally shocked and is in a state of hysteria. my best friend was equally shocked and cries that he would commit suicide. he cannot live without her. wats the solution to them? live dearly only to die? or to die collectively now?