If I Unfollowed you - please, don't think that I do not like what you share! I like a lot of stuff, and if I started following you, that means that I still like it :)
Just Tumblr does not give us a way to group/organise somehow all our likes and blogs we follow, that means - that there is a lot of info, and it is impossible to read ALL and I know I missed a lot of good stuff, so I just have to unsubscribe from some random blogs :(