I think you two are not in the same page.

Honestly it’s wise to discuss exclusivity before sex to avoid confusion and misunderstanding. I think he assumed you two are exclusively dating because you slept together and he is hurt you are dating others. Of course it’s unwise of him to not discuss all this before sleeping with you.

This all started on a wrong foot. I’d give it another chance and go on another date but it doesn’t sound promising

Also if he gets high (or drunk) and sends texts he might not be a healthy relationship prospect.