Torbleh,
If you're leaving, maybe spend a fantastic "last" night with her, get her something nice and permanent, like a stuffed animal or necklace. Leave her with that, the memory that you care for her and that you're worth any inconvenience she may go through.

Aside from that, it sounds like you two may need the time away from each other.

I hate to be rash like this, but reading your other responses, you are too involved with her feelings and wants and needs, you end up neglecting your own. You have many problems, and all you have spoken about is her...it sounds as if she's also a problem. I understand you care for her and want it to work, but you need to think about yourself as well. If you wanted her to be in a perfect relationship, you'd put a mirror in her hand and let her talk to herself.

I'm sorry if I'm sounding impatient, and a bit out of tune, but I'm horribly concerned about you. You fret over the fact that for a second she may think you're breaking up with her, but if she spins you into a spiral of depression or belittles your time with her, it must be your fault...not only is that inaccurate, it's unfair! You deserve more, you deserve better. Give yourself the chance to make yourself happy, to find someone that will make you laugh, but will hold your hand and dry your tears when you are not.

I know that my words will do little to turn you from this relationship, and if you truly feel like you need her, I wouldn't want them to. My suggestion? That you leave her with the gift and the memory of a great time, you go and focus on your studies, on yourself, find a passion for something and when you return, visit her...is she wearing your jewelry? Does she sleep with your toy? Does she have your picture as the background to her phone? If not, take final note: she doesn't think you are worth her time, and isn't worth yours. You DESERVE better and you NEED better if you're going to GET BETTER. So sorry if I upset you, I understand if I did. I don't want to sound like a parent who doesn't understand, but I'm afraid of the damage this will do in the long run. If you decide to devote yourself to her even before you go away, I'm still here to support you and try to find ways of helping you get what you want. Much love.