Is it ok for him to hurt my feelings?

I have a really good male friend. (I'm female) for the last 7 months we have talked and text ed on the phone several times per day. he has never not answered when I call him. We also work together we are suppose to go to a picnic together and we need to sign up by Tues if we are going to go.

Last Wed I called him and it rang one time and went to vm. later I called again and it went to vm.

Thurs I spoke with him for just a few min. About work then I seen him at work and he acted fine. On Thurs evening after a meeting at work he ran out like he was in a hurry and wasn't going to even say bye to me. but then he came up to me in the parking lot and said I cant make our plans on Sat I have a date. I said ok and he was gone. On Fri I spoke to him and he was ok again. Then I left him a note about the picnic asking if we were still going to go together. He never called so later that night I called him and again it rang once and went to vm. that tells me he is rejecting my calls. It really hurt my feelings that he done that so I sent him a text telling him that its ok for him to have a g/f but its not ok for him to reject and ignore me and my calls after I have been his one true friend and the only one who has been there for him when he needs someone. I still have not heard from him. Am I wrong to be upset? No Im not jealous of this other girl. just feel like now he has no use for me. We have been through alot and helped each other through some pretty rough times lately.