This isn't coming from personal experience, but just my thoughts on things.
The only reason one of you should change plans, go to a different school than you want to, etc. would be if you all plan on getting married. If that's the case, then maybe getting engaged is worth considering so that both of you know that the relationship is coming first and the schooling is second.
On the other hand, if your not to that point yet. You could both apply to schools without the expectation that one of you will make a big sacrifice if things don't line up right. If things work out, then great. But if things don't work out then maybe you will part ways.
Best of luck with the application process