Around the beginning for summer, my friend stopped answering and returning my calls. I don't know what to think of this. I have thought up of possibilities ranging from my friend just being on a long vacation and not wanting to be bothered, to something terrible has happened and physically preventing my friend from contacting me, to my friend being mad at me for some reason that I can't possibly think of, to just being ignored. I really don't like losing friends, especially after knowing them for quite a while. Even though I haven't been calling on a consistent basis (around 5 or 6 times in the past 3-ish months), I'm assuming that at least one of these calls would have prompted my friend to call back. We are both adults (early 20s) and if my friend does not want to talk to me, I'm fine with that, but I would like to know the reason why. Is it me or is it something personal? Obviously there is no way for me to re-establish contact (not answering the phone), so it is not like we can talk it out (at least until I get a call back), so I don't know what to do. Should I continue leaving voice mails? Perhaps leave a guilt inducing voice mail ("I haven't heard from you in a while and you are making me worry")? Maybe try email? I'm not at the point where I'm ready to just drop this and stop trying. So, any suggestions would be great.