Do I have the right to be mad?

Should I be mad if shee don't put "in a relationship with (name)" on facebook since me and my girlfriend are together. And also a guy started calling her babe and saying i love you when we were dating also. i told her to tell him that she has a boyfriend but she didn't want to because she said this "guys who don't know the other guy won't trust them" well yea that makes sense since he's saying all those things. so should i be mad at her for not telling him that she has a boyfriend?