"Sa petite amie"(his girlfriend) is correct and the possessive adjective agrees with the possessed (petite amie) not the possessor (the person whose girlfriend it is) .
Hope this helps!
And you would also use the masculine form if the noun starts with a vowel:
Son amie but sa petite amie.
Even though amie is feminine, you use son because it starts with a vowel. With petite there's no need for this anymore because it starts with a consonant.
so in the case of amie, you would not need the 'n' as the adjective does not begin with a vowel.
the pronoun changes as a result of the word following it and not the noun?
sa petite amie
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