It happens a lot to me too. What I have noticed is that those friends whom I meet in person regularly have stayed friends, while those whom I interact with mos

It happens a lot to me too. What I have noticed is that those friends whom I meet in person regularly have stayed friends, while those whom I interact with mostly online (due to distance or schedule) have drifted away over time. Personally, I'm not too troubled by it. I don't think it should trouble you either - after all the other person too has lost a friend in you. But if it does, then I suggest meeting them in person if most of your interactions are currently online.