Most Helpful Girl
Unfortunately, yes, she would. Many girls say "I love you" without meaning it. For some people, saying that is a big deal, but for others, it's just like saying "you're cuteee". If you are sure she doesn't like you, then you should break up, even if you still have feelings for her. But, if you're in doubt, you have to ask here to look in you yes, and then ask really seriously: "do you really love me?". If she doesn't, she'll probably get nervous. Maybe, she'll say "sure" even if she doesn't love you. In that case, ask her again.
Most Helpful Guy
Obviously girls are quite good at lying.
They can say I love you to many guys.
That's the sad reality of the modern world.