In a cast iron fondue pot (or a regular pot) melt cream cheese and buffalo sauce on medium heat until melted; stirring to ensure it doesn't burn (about 5 minutes).
Once you have a sauce like substance in the pot then add the three cheeses. Mix well and add the ⅓ cup of milk. Mixing until everything comes together.
Serve with celery sticks and fried chicken strips
Notes
This is very similar to buffalo chicken dip! Just keep in mind it's more fluid so dip accordingly.