In the first 3 weeks that we got together I told her about this guy that was trying to talk to me wanted to take me out for my birthday. And I thought that she should know since she tells me who likes her and who use to like her. She asked what did I say and told me that I could go with him and she's knows where I am. Why would she want me to go with someone who likes me.
Well if I wanted freedom I wouldn't be in a relationship. I would be single. It still doesn't explain why she was ok with me going. I wouldn't be okay with that if it was her.
Why are you worrying? .. you have been together for a while now.... or perhaps she wants you to find someone else. Of course the most simple thing is to actually ask her. I think you need to have a long chat with her ... it is a far better idea to do that than ask people who are total strangers to both of you.