In the Shadows-of-Amn part of BG2, party members can leave the party if:
a) They are very dissatisfied with the party's Reputation, or
b) They come into violent personality conflicts with 1 or more other party members.
In the Throne-of-Bhaal part of BG2, however, neither of these situations will happen. I believe that even a Lawful Good character (such as Keldorn) won't abandon you even if your Reputation sinks all the way down to 1. He'll complain quite a bit, but he won't leave.
In BOTH parts of BG2, certain characters may leave the party due to specific scripted plot events.
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Volothamp's Comeuppance
Everything you ever needed to know about the entire Baldur's Gate series......except spoilers.
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