First, he's playing with your head. If he has not filed an actual return, then he didn't get the stimulus. It doesn't matter if you paid something, only the people who actually filed return are going to get it.

I would contact your accountant and see if he filed. And if he listed you on the return. If he did, ask who signed your signature to the paperwork because you didn't sign anything, he could end up in a whole lot of legal trouble if he filed married filing jointly and didn't get your signature or permission. With both the IRS and the family courts.

Once you know if he's filed or not, you will know what you need to do. If he filed married filing jointly, you need to contact your attorney and tell him/her what he did.