Do I have a right to be upset about this?

I don't know, man, I just don't know.
Cry, that always works.

There's no good reason bạn should be mad anyway because I don't know the full story on how both things happened.

i wouldn't say bạn would hoặc wouldn't have the RIGHT to be mad. but happy birthday!

Sunday is my b-day... and chances are i'll be spending alone, hoặc with bạn guys ;_;

Yes bạn have the right to be mad.
No bạn don't have the right to be mad.
I don't know.
Eat cookie.
Hug someone.
Spray Windex.
Solves everything.

I think bạn should be upset honestly. I know I would. bởi the way happy birthday. I had a birthday just yesterday.

First Happy Birthday!!!
bạn have a right to your feelings. Before bạn decided to be angry at your friend, do bạn know what he was thinking? Did he know it was your birthday?
My suggestion is to talk him about what happened and how it made bạn feel. bạn may think it's obvious, but some guys are slow on picking up such things.
Remember, just getting mad will hurt bạn thêm than him.