As long as your ex did not (erroneously) file jointly with you for 2019, she will not receive your stimulus payment. You will want to file your 2019 return ASAP so the IRS has your filing status and direct deposit information for issuance of the payment.
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2018 taxes was filed jointly which got snatched but 2019 I didn't file taxes he filed by himself so I haven't received my stimulus I'm wondering what's going on he received his because he file taxes for 2019 what's going on
Are you required to file a 2019 tax return? If you are, you should go ahead and file it.
If you are not going to file a return, use the non filer portal to register for the stimulus payment: https://www.irs.gov/coronavirus/non-filers-enter-payment-info-here
See the IRS portal for your current status: Get My Payment | Internal Revenue Service
See these Q&As: https://www.irs.gov/coronavirus/get-my-payment