It depends on the type of the misdemeanor; your immigration status; potential hardship issues; your income and many other issues.
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It all depends. A deportation typically requires the person to remain out of the US for ten years. Unlawful presence in the US can also result in either a three or ten year bar to re-entry. A drug conviction - for any drug bother than marijuana - will result in a lifetime bar to re-entry. If the drug was marijuana and less than 30 grams, then this can be waived as long as it is the only drug related conviction.
Looks like your fiancé is out for at least ten years unless you can get the criminal case reopened and thrown out then persuade the feds to let him back early on a parole.
The answer provided here is general in nature and does not take into account other factors that may need to be reviewed for a more precise answer. You should consult with an immigration attorney before taking any action. The answer here is not intended to create an attorney-client relationship.
I agree with my colleague. You need a consultation with a knowledgable immigration attorney.
No attorney-client relationship is created or implied by this communication in any way. Consult a competent immigration attorney.