Relationship Advice?

I am 20 years old and in college and my friend that I have had for over 3 years now and I finally had a date. But the problem is I'm in college on the other side of the state, and I can see myself falling very hard for him. I know he is already ready for marriage and to have kids, but I have two years to go. And I would really like to date him, but we discussed that we would not get into a relationship because of my college situation. What should I do to help keep my guard up with him and not fall for him? ADVICE PLEASE!!!!!Relationship Advice?
I think that you should set specific boundaries in the relationship so that you can keep focused until the time is right.