Few things. One, you do what's best for you;not her. Two, if she treats you well, stick with it until tides turn. Three, expect ladies to act and be ladies, nothing more or less. Four, take what she says with a grain of salt. Remember, it's not what a person (male or female) says, it's what they do. Actions, at any age, speak louder than words. Four, lotta STDs. Stay safe. Both get tested and use your brain between your ears for decision making; not your penis.
Aside from that, have fun and experience life!