Mandarin · Chapter 11 · Lesson 15 · Grammar primer
Modals and future intent
会 vs 能 vs 可以 distinguished properly. Future intent with 想, 要, 打算, 准备. Negating 必须 with 不用/不必, never 不必须.
The short version
The opposite of must is 不用 (bú yòng), not 不必须 (bú bì xū)
必须 (bì xū) does not negate the way English 'must' does. Its negative is 不用 (bú yòng) or 不必 (bú bì), meaning 'you don't need to' rather than 'you must not'. For an actual prohibition you want 不能 (bù néng) or 别 (bié). 不必须 (bú bì xū) is ungrammatical and it catches everyone at least once.
你不用来。 Nǐ bú yòng lái.
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