Is she really my friend even though she stole my crush?

I used to have a friend like this.
She likes your company but yet she doesnt like you at the sametime.
She is jealous of you and you make her insecure, so she steals your guy as a way to say "ha, I got the guy, that means I'm better than you." even though she has never told you how she feels. Thats basically her way of saying basically that.

Or
she's used to being the center of attention and when a guy starts showing you attention she steals him away because she's jealous that some1 is interested in you and not her for once.

If she knew you liked him, then NO

Friends are hard to come by. The "crush" also slole your friend. Forgive and be happy for them. IT may not last then again, it may. Crush is not a bf, it is love from a distance, and you were distant which gave her room to act.

If you told her your crush than no if you didnt thank shes your frayend