Am I overeacting?

A colleague whom I have had several problems with in the past volunteer to assist on a project. We spoke in detail about the logo this if the project, role out, publicity, implementation, staff involvement and most I all administration permission.

A meeting was set up to discuss the plans with the director of development on Oct 9th to ensure our project was in alignment with hospital compliance. My colleague and another nurse decided to place flyers all over the unit with information and details about the project while neglecting to communicate with me before the confirmed meeting.

I requested an explanation on why I was not told about the flyers even though there was a collective decision previously to not reveal any information before we had permission to share with the rest of staff. Needless to say I was at work when the flyers were posted and neither colleague bothered to let me know.

I let my manager know who informed me that the girls were now scared of me because I confronted them.

I worked tirelessly on a written proposal for presentation only to be told by one of them the meeting was cancelled with the director of development. Ten minutes before I called the directors office to find out if the meeting was indeed cancelled. I was informed by her assistant that the meeting was never cancelled and will be expecting me. In a rush I had someone cover my patients and conducted the 20 minute presentation.

Unfortunately I was informed a few days later that the hospital was not interested in working with us on the project due to a full roster of events this fall

I was called into my manager's office she stated saying she was sorry that the project was cancelled but was now I have been given the reputation a bully and also informed it would best to save face and never discuss the matter again.

The colleague I have the issue with is also friends with on face book with manager.

Is requesting an explanation equate to bullying? I'm devastated but the label.

Thoughts? Comments? Suggestions?