<human>: Could you distill the essence of the text into 1-3 sentences?

Before I start let me just say I know I'm young and inexperienced but I hope that doesn't make this all meaningless, I really do need a little help.  

Alright so we've only been dating for five months but she's already crazy in love with me, and I'm not really not sure how to handle it. She goes to a different high school about 20 minutes away and I'm currently in between cars so I only see her on the weekends if everything works out. We've got one of those text message relationships and she constantly tells me how much I've improved her life since we started dating and how she couldn't live without me. I mean every time we fight she tells me she almost has a panic attack thinking about us breaking up. 

Don't get me wrong she is an amazing person and I wouldn't be posting this if I didn't care about the way she feels. So far she's been a fantastic girlfriend that any guy would be lucky to have. However I'm just scared because this is completely out of the blue and she has no idea I want to end the relationship, and us breaking up is going to wreck her. I really do care about her and I want to do this the best way possible.

I'm ashamed to admit but I don't really see a way to do this in person, I mean I can't breakup with her then ask her mom for a ride home, and I need to do it soon because she deserves to date a guy who is just as crazy for her as she is for him, and unfortunately I'm not that guy no matter how bad I want to be.

I don't know if it matters but the reason I want to end it is because I still have feelings for an ex and they're too strong to ignore any longer. 

I know there is an easy answer to this question but I'm not very experienced in break ups and I really would appreciate some advice so I don't end up feeling like a horrible person, thank you.
<bot>: Girlfriend is completely in love with me and I don't feel the same, how to approach a breakup when it's out of the blue?