Relationships get difficult when we don't even feel like we can talk to the person. Can you at least talk with him about how you don't feel like you can talk with him?

If you're going to break up with him anyway, at least lay it all out, a summation of your post, on the table to talk about. Maybe it's the wake-up call he needs.

Or maybe he'll just get defensive and deflect.

And there's your answer on what to do.