<human>: Can you condense the text into a few key points?

Foreward: I'm a terrible writer and on mobile so this might not look pretty

Background info: I have been dating my gf for almost 3 years, great relationship....blah....blah....blah. When I graduated university she still had one year left and we never really talked about us when I left. It was a do you want to stay together? Followed by two yes's. 

The past 9 months: have been mostly good with some bad. We've both had our waves with the relationship but overall I am still happy in it. We are about 3 hours away so we see each other 1 a month. Whenever there is a break for school she'll visit me for a week or a weekend, otherwise I always visit her. The cost to travel tk her isn't a big deal because I have a season pass to the train, meaning travel costs about 1100 per year, less than one of my paychecks.

My girlfriend has with much consideration decided to go to graduate school. She consulted me on it and I was fully supportive of her going. I think it'll be a good thing for her especially in her field (civil engineering)

This has extended the long distance timer to summer of 2018. We'll pop out of this at 25/24 with 5 years of dating, ill be well into my career and at that point looking to start to begin the process of settling down. I am okay with the long distance timer bekng extended but before investing another 2 years I'd like to have a serious conversation with my gf about our future.

What are some topics that should be brought up? And how should I go about bringing up the conversation?

If I left out any important information, let me know and I'll try to edit it in.
<bot>: 2 extra years of ldr, want to have a serious conversation about it, don't know how to bring it up/ what to say.