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I can't say about the third part, we, English players, haven't even got to read the second one.
About the ending of Baiqu, we know that He Jia didn't know about Jiayun's approaching death, so we can rule out one of the endings. As for which of the other two endings was true, whether Baiqu protagonist loved Jiayun or Yang Qin, it should be revealed later. Personally, I'd prefer the Jiayun ending.
Maybe I shouldn't try to communicate with you, Chinese players, to avoid spoilers for second part, but... alas... I'm simply tired of waiting.

我觉得百曲三个结局都不是很冲突啊，感觉像是三段时间发生的事，说不定三个结局都发生了呢

Originally posted by Gemini5zz:

我觉得百曲三个结局都不是很冲突啊，感觉像是三段时间发生的事，说不定三个结局都发生了呢

No, it's not like that, at least because in two of three endings He Jia never learns that Jiayun has not much time left until it's too late.