A woman entered into temporary marriage (mutah) with a man who agreed to the dowry. After several months, the woman wishes to terminate the temporary marriage before the specified end date, but the man will not accept. The couple did not have sexual relations, and the dowry was never paid by the man. Is the woman free to end the temporary marriage?
Only the man may end the marriage before the specified time by forsaking the rest of the time period. But he still owes her the dower (half of the dower if they have not had intercourse, the full dower if they have had intercourse). For further details visit:
https://www.sistani.org/english/book/48/2350/