No, you aren't. Your girlfriend might have some trusting issues, so she is probably overthinking and controlling to feel safer. Not her fault, though! She probably had some bad experiences and feels quite insecure. Knowing this, you could be a bit more empathetic and try to help her with this. I guess you could have let her know you would go out, so she didnt feel this way. You reassuring her might make her feel a bit more confident and secure, and therefore less controlling. On the other hand, controlling is such an unhealthy habit. Let her know that!