I think It’s something that is part of life, i think that all people have experienced that , at some point in its lives.
In my case a close friend (or so I thought), a friend of many years who changed overnight, for no apparent reason. At first I felt horrible I thought it was my fault and I tried to get closer to fix things, many years together could not end like that (well that’s how it ended) after that I turned that feeling into fuel to improve in my future friendships, in my personal life and in everything I did. Over time life showed me that in 90% of the cases the people who leave and do not come back is because they do not want to and in most cases it is better that way. This was one of those cases.
I know it’s hard but cheer up, mate, everything happens for a reason and what’s to come is sure to be good, you are a good person and life gives you that back, you will see it
People drift in and out of one's life I guess, I'm old enough to have had it happen many times, and I generally move on quite well however that doesn't negate or eliminate the feelings we have when it happens right?
I'm not un-cheered at all actually, but it's probably difficult for you to know that considering you don't know the situation at all. That doesn't mean I don't feel things though, that the loss doesn't effect me. I have a heart after all, contrary to what some believe.