Am I wrong for telling my fiancé I won't keep paying the mortgage on a house he co-purchased with his ex?

I’m refusing to keep paying for a house bought by my fiancé and his ex, given mounting issues. I plan to buy my own home. Am I wrong?

I wonder if discussing this more openly might uncover compromises that work for both of you? I’m curious how you envision dealing with shared financial responsibilities while protecting your own interests. What have you thought about as a starting point?