Some people are very lazy with their friendships and just want everything to revolve around their convenience.
It's selfish, and ultimately the other person is going to get sick of being the one who makes the effort all the time. One-sided friendships rarely go the distance.
I was friends with someone like this. The deal breaker for me was when she texted me the afternoon before my wedding to say she wasn't coming for a really lame reason. I ceased communication from that point.