Sounds like a long month!

After you do an honest self-assessment and address the "is it me question" [and figure you can fly], I'd ask him point blank if he thought you had a problem flying the airplane.

Pro-Stan could be a solution but only after you confront him in the most constructive way you can about his flying lessons.

If all else fails, and your only flying with him for a month, reject his offer to fly any of the legs and just be the PNF.