I know the feeling man. I've been trying to invest in people for a good while now and it seems to backfire a bit. It seems that in today's day there is an outbreak of terror when it comes to commitment, even on the level of friendship. I'm currently dealing with a scenario myself where a friend of mine, in my opinion, is totally mishandling our situation by making space where I honestly think there doesn't need to be. It's made the relationship awkward and made things worse. I suppose the fear can be narrowed down to something I experience almost routinely at this point. I commit to people and they either can't or won't commit back. That leaves a mark. It hurts a lot and I would believe many wouldn't try simply in fear of that pain. I can tell you why I keep trying though, because the pain I am currently experiencing is nowhere near as painful as the apathy would be. If I didn't care anymore I would become bitter and sour and despise everyone inherently. I continue to commit in the hope that I find someone who isn't scared of making friends they want to keep. That feeling itself, will defeat any pain I feel from those who turned me down.