<human>: My boyfriend and I have been together for a little over a year and every so often (read: every couple of months) we both hit a bad place with our depression and anxiety at the same time. Whenever either one of us gets upset at the other for even a little thing we both kind of spiral because of our moods.

This weekend he was 30 minutes late to something he promised he would show up on time for. I brought it up to him and he apologized. However the next morning I was still kind of upset but it was more my depression that was weighing me down. He said that he felt like I wasn't telling him the whole story or that he feels like there is something worse wrong. This is my first serious relationship and I'm still pretty bad at explaining how I'm feeling, but there is honestly nothing larger wrong he just assumes that there is because I get really quiet when I'm upset.

Point is: How do I explain my feelings in a way that makes them sound complete so he doesn't think I'm secretly upset about something else? Also do you guys have any advice about handling days when both of you are in a bad mood? Last thing, just advice on how to figure out what's actually bothering me? Sometimes I'm not even sure why I'm in a bad mood.

Condense the text into a few key points
<bot>: My boyfriend thinks that I am too quiet about my feelings and he thinks that I don't talk to him. How do I fix this?