Do I walk away from my best friend?

I would appreciate your opinions as I'm very hurt by my girlfriend's behavior towards me. My girlfriend and I have been best friends for 8 years (she's 26, I'm 25). We've shared a lot and have always been there for each other. During this whole time (and before meeting her) my girlfriend has never been in a relationship with a guy, she meets them but it never works out. I thought it would be a good idea to arrange for her and a good guy friend of mine to get together and see if something could develop. After 3 dates in 1 month my guy friend ended it due to not having much in common. My girlfriend was upset and told me she didn't want me to tell her anything pertaining to my friendship with him. Of course, I continued my friendship with him and went on our usual various outings together as we did prior to him meeting my girlfriend. I didn't it tell her about it since she made it clear she didn't want to know. She called me one day asking why I was with him (someone saw us when were out and told her about it)and why I didn't tell her about it. I told her, I was respecting her wishes and I had nothing to hide. She preferred that I stop going out with him in case it would develop into something more than friendship. She wanted me to promise this would not happen. I told her, I don't need to call her and ask for permission of when to see him, nor do I have a crystal ball of the future. This happened 2 weeks ago, since then, I left her a voicemail message and I text her asking to get together and talk this out. I received a very hurtful, accusatory and judgmental text message ending it by saying she is blocking me from replying and cut contact. Needless, to say, I feel very hurt and very harshly misjudged as I have always been there for her.