Maybe he's just as fed up as you are...no one's perfect. I would just be open but civil with him, ask honestly whether you're more invested in the friendship than he is. If you get a '.....' then there's your answer.

Some people just aren't cut out for dealing with more serious issues in a friendship, if this is the case with your friend maybe keep things going on a more superficial level but look for a deeper kind of connection elsewhere.

You could just drop him completely but it's usually not the best thing to do...if you end up regretting it and going back to the person it just makes for further embarrassment and regret. If you're not up to talking him directly be a tad aloof for a bit and see what to do once things cool over. Good luck.