My girlfriend would rather run from our problems...?

Whenever she does something that gets under my skin, she never even bothers to ask me what's upsetting me. She just says "well it's obvious I did something to piss you off so I guess I'll just leave you alone." When I do insist we talk about it, she never wants to. She'd rather "bury" problems than deal with them head on and put them behind us. What should I do? I've told her this countless times and I'd really like her to respect me enough to take my concerns seriously.