Ending Child Support

[Finny]

My 18 year old son will meet one of the emancipation parameters when he graduates in June AND starts his newly obtained full-time job.

Do I need to go back to court to stop making payments?

Or do I just give my ex a friendly reminder that payments are ending or do I just stop and let her figure it out and find her copy of the separation agreement?

Also, in the event he loses this job or changes his mind and goes to school, does the old agreement just kick in again or do both of us have to go back to court and extablish new guidelines?

Thanks