The licking movements could be dry mouth due to marijuana. The psychotic stuff could be due to routinely lacing said marijuana with PCP.
In my opinion, there is likely much more to his relationship with Leila than he is admitting. If she did, according to his story, yet again leave him behind in favor of other men after giving her $3000, he could have just lost it. He says she didn't come back. But what if she did? He could very well have come across her again later that night, but he is not telling us that. Why? Because that is when something happened.
MOO and all that.