I could use some advice.

Last wednesday my gf offered that we should meet in the city and then walk home together. Before she was on a small meeting with some of her friends. Boys and girls. I belive that there were some people from her previous relationships also.

We didnt have exact time for meeting but the plan was to arrive home quite early. One moment she called and said that she wants to stay longer and maybe we could do something tomorrow.
I actually didnt like this and said that if she doesnt come I am busy next day and then I drive away from the city and generaly that I am not interested to spend time with her.

She came to me. I won. But I dont feel actually like a winner. What should I have done?