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I am sorry to hear about this situation. Until/unless your partner is divorced, he cannot sponsor you. Which means you can:
1) Wait for him to finalize the divorce, and then file for you (the wait for processing is about 6 months from start to finish); or
2) Come to USA on a student or work visa. Out of these, student visa is easiest. Let me know if you need more information about this. However, know that in terms of paperwork, it may simply be easier to wait for him to be divorced so he can sponsor you.
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