Honestly I don't think Paul will ever let Jason go. It would have to be Jason becoming unfogged and leaving him. I know he sometimes comes across as an overgrown teenager but Jason is actually the grown up in the relationship. Without Jason Paul is financially screwed both financially and emotionally. He hasn't paid into a pension for most of his life, no assets, he can't drive himself to gigs, useless at technology. Paul flounces out of jobs where Jason stays even when under stress as the rent needs paying.
If only Jason knew that Paul needs him more than he needs Paul