His female co worker called at 1:30 am and I said why she calling this late? Then he said he is the one who accidentally dialed the number wrong. Then couple days later I added her in my FB list and my BF went ballistic on me saying he doesn't want his co workers to know his personal life. She's a waitress and my BF is the chef. Should I wonder?

Why would you be adding her on Facebook? Don't worry about co workers, unless you see a disturbing pattern of behavior. Much, much more than you have written about here.

Has he cheated before or something?