I drank beer from same glass with my friend two weeks ago, and week after her boyfriend realized he has mono. she didn't get it yet. my chances?

Little or no risk: Epstein Barr virus (EBV), the cause of infectious mononucleosis, is not spread by such indirect contact, only by sex or kissing. Don't worry about it.

You're prob. safe: 10-21 day incubation period, so unlikely girlfriend had mono when you shared the glass. You can't get it if she didn't have it. If she gets symptoms soon, such that they had a common source, I still think your risk is low. ..unless you were all hanging out with the same source 2 weeks ago...