Well, I think that there are two big issues here…
First, is this statement: “she feels that she really has not done a lot of dating and she wants to see whats out there.”
And the second is: “Our relationship is long distance which means I only see her like every 3 months.”
Based upon your email, you both sound very, very young to me. That said, honestly, I agree with your former girlfriend that she needs to date other people and see what’s out there. What’s more is, I believe you should be doing the same thing too.
Regarding the second issue… Quite frankly, I am not sure why either of you would elect to be in a relationship whereby you can only see each other once every three months (unless one or both of you are in the military)? Long distance relationships are very difficult to maintain and (generally speaking) only work out when one of the parties plans to move to where the other is.
My suggestion would be for you to find someone to date closer to home.