Often, even if we have the best of intentions, life tends to get in the way of staying in touch [1] with the people that we care about. It’s easy to put off a phone call for one week and watch it turn into four, until finally a year’s gone by without a single word exchanged. Before you know it, you’ve inadvertently lost a friend that you really cared about and enjoyed having in your life. To check out tips on avoiding this common problem, .

• There’s no doubt about it, keeping in touch is hard work, but it should be worth it. If making the effort doesn’t seem worth it, then perhaps the person in mind isn’t really someone you want to remain friends with, in which case don’t bother. It sounds harsh, but you'll save yourself a big serving of guilt later on.
• Once you’ve made the decision to make the effort, then it’s time to start following through. Schedule your calendar once a month to remind yourself to send an email or make a phone call. Make sure to note all the important dates that pertain to that person, too — their birthday, wedding, graduation, etc.
• When your reminder goes off, it’s possible you won't have enough time to devote to a full catch-up call. If that’s the case, make the call a quick one and talk to your friend about setting up a phone date sometime soon. Everyone has time for a two-minute phone call to let the person know that they’re too busy to talk right then, and although a phone date might sound silly, it's a great way to make time without rescheduling your life.
• If you haven’t called in a few months or forgot to call her back the last time she called, don’t let yourself continue to avoid calling out of guilt. It'll only make things worse, and of course, the more time that passes the more difficult it will be to pick up that phone.

It truly is invaluable to have people in your life that you’ve shared memories with and who've seen you grow into yourself, so make it work even it means planning ahead!

Source [2]