Upset

I have a few friends who have recently ghosted me for no apparent reason :( I was literally hanging out with them all the time a few weeks back and now whenever I try to contact them they either take forever to reply or ignore me:( they have problems in their lives and are going through some stuff but it makes me upset that they don't bother to even be here for me.. am I in the wrong? Should I just quit trying and make new friends instead?????