<human>: Can you provide a brief rundown of the text in within 3 sentences?

My girlfriend [20F] and I [22M] have been dating for a year and a half.  She's an amazing woman and I can see myself spending the rest of my life with her even though we're both so young. She's helped me find direction in my life and I'm extremely happy with her.

When she started college at the beginning of our relationship, I was extremely nervous. I'd heard everyone say that relationships rarely survive college and that we didn't stand a chance. However, despite everything, we get along better now than ever.

In a month, I'll be moving across the country, about a 5-hour plane flight away from her in order to go to college myself. She may be transferring to a school nearby here for the fall semester of next year, but it would still be close to a year before I saw her again.

Redditors, what are your best tips for keeping the spark alive while apart? We both want to stay in the relationship, and I'm planning on getting her a little something to remember me by before I leave. Again, all the worries of relationships not surviving college are coming to mind again. 

We want to make it work out, but I'm worried about her getting bored. She's extremely sexual, and I fear that with me gone she'll find someone else. I know it's probably not going to happen, as she's proven this several times, but my insecurity still makes me worry.
<bot>: Moving across the country from my girlfriend. We both want to stay together. What are the best ways you know of to keep the spark alive?