I'm wondering if you could ask him now if he has ever been with a prostitute and if he says yes - agree to the annulment - seems like your only chance. You are going to need a lawyer for this for sure...
Not "been with" - it's just "been".
Quoting VirginiaAnnulment
We were married for just over two months before I told him to move out.
You kicked him out after two months - and that was how long ago?
Note that if you consult a divorce lawyer, your lawyer should be able to advise you as to the chances of obtaining an annulment.