It has been 9 months and my boss is always putting me on projects that are dirty, paused, or no one else wants to do. How do I ask him to change?

What do I make of this? Does it mean that he doesn't trust me or my abilities or does it mean that he has a problem with me? I've tried asking him for this, but he just avoids any kind of conversation and our 1:1 are mostly project updates. This is an example of a good company having a bad boss damaging my experience.