Not until you get married.
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You must be married first. Also what status did you have before overstay.
The above is intended as general information only and cannot be relied upon as legal advice. Laws change constantly and vary from state to state. The legal principals discussed may differ substantially from your personal situation. Therefore You should consult an attorney about your particular situation. (212)880-1538 Law Offices of Tsirina Goroshit is a Full Service Immigration Law Office, at 275 Madison Avenue, 4th Floor New York, NY 10016
Fiance is not considered an immediate relative and cannot help you in adjusting your status. However, if you get married, he can petition for you as a husband and you will be able to adjust your status eventually.