For me, It does bother me that some of my friendships I make most, or nearly all of the initiative, but I get so much from the friendship when we do talk / meet up, it's worth it for me to swallow my pride and ignore it. In 99% of cases they aren't deliberately ignoring you, they just got busy, etc.

The friends that make 0 effort however I cut out. You gotta give me something to work with...