<human>: Can you condense the text into three sentences or less?

Me and my girlfriendd have been dating for about half a year now and things have overall been good up to this point. We share a lot of common interests and overall I think we're both happy with our relationship.

The problem that I'm facing is that one every week and a half or so, she'll break down crying once we get back to her place. Whenever I try to ask what's wrong or what shes thinking about that's making her so sad she always insists that it's nothing and she's just being dumb or silly. I have no idea what I can do to help but I feel like there's some kind of massive communication issue going on. There are times where she'll cry for a while then go to bed and later I'll get an apology text, and maybe 1/4 of them offers some reason behind the breakdown.

I just don't know what to do any more, I want to try to help her and I've tried recommending therapy (I see one for my depression and it's been incredibly helpful) but she always insists that she couldn't talk about her problems with a stranger and it would be too weird. I love her, I really do but having to watch her be miserable twice a week is starting to pain me and I really want to know how I can help her be happy.
<bot>: Girlfriend breaks down crying weekly for "no reason". I'm lost and need to know if there's anything I can do.