friends

One of the great things about long-term traveling is the people. You meet all kinds of people with different backgrounds, life experiences, attitudes, etc.
But for the most part, the people you meet can be split into two categories based on their reaction when you tell them you're staying in town for four months.
Type 1: Really, wow; that's a long time.
Type 2: Oh, just a little while then!

I've found it's much easier to get to know the Type 1 people, for the basic reasons that they're experiences are similar to yours and therefore conversation flows pretty easily, and, like you, they're eager to make friends. And while Type 2 people are generally very nice and eager to talk, they already have their own lives, making it a little difficult for them to fit you in.
Type 1 people love to share travel stories; typical topics include the different flavors of peanut butter throughout the world, the cost of alcohol in different cities, where the best hostels can be found and any type of travel adventure story. Eventually the conversations begin to have more normalcy and everydayness, and you start to feel like you might actually have roots in this city you're only living in for four months.

But unfortunately, as soon as that feeling comes along, it's bound to be the time for you or your new friends to move on to the next city or the next adventure. So you say goodbye, maybe have a farewell party, promise to stay in touch and catch up with each other when you're in the same part of the world again, and move on.
It's a bit sad really, but it's a part of life for travelers. One of the great things though, is that some day when I feel the urge to visit a random country in Europe, an island in the South Pacific or a different state, I can email one of my traveling friends, and say "Hey, remember me. We were friends in New Zealand for a while."