Before I left to go traveling, I was in the same boat. I had a friend who wanted to join me, but who was not committed to saving $$$ at the same rate. As we got closer in I started booking tickets and planning with an attitude like "this is what I'm doing, you're welcome to join me." In the end, he never pulled it together, I went off for a year by myself and looking back I don't think I would've wanted it any other way. I think it's really important that if you are going to travel with somebody, you are both honest about what you want to do and how much money you want to spend. It can be quite an awkward situation (and potentially friendship ending) if you have the money to truly do what you want to do, but you're with somebody who can't afford to come along. Just my two cents (no pun intended).