You should file your return by mail and file as Single (possible other filing status available if qualified). Your return will not be accepted electronically because your name and social security number (SSN) are on another return. I won't say not to try, but it's unlikely it will be accepted. Filing status is always determined based on a taxpayer's status as of December 31st.
Your ex filed incorrectly so that return must be amended. When your return goes in the IRS will question this return.
If you have children you may be able to file as Head of Household. See the information in the link below. Also TurboTax will walk you through the questions as you prepare your return.
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