Is conflict okay?

Lately I feel like the "honeymoon" phase has worn off with my boyfriend, which isn't bad, but we are arguing more often. Personally, I like to approach conflict head on, and I believe that conflict is important and part of a healthy relationship when handled correctly. However, he abhors conflict and tries to joke around and be touchy feely, which just makes me even more angry. And if he's ever upset, he will essentially go into hiding until he feels better, which also makes me angry. It makes me feel like I can't share my feelings with him because he bottles all of his up. How am I supposed to support him if he won't talk to me about what's upsetting him?