<human>: We've been dating since graduate school for roughly a year and a half. I'm no where perfect but I put all my effort into trying to show how much I appreciate her and make her feel cared (ex, text every morning how she's doing, occasionally order food for her when she's too busy to cook, skype at least every other day). 

Right now we have separate jobs in different regions of the country but her mom still lives nearby where I work. She's a really caring person and has shown that numerous of times when things *go well*. But every now and then when I make a mistake not intentionally she gets mad and makes sure I know I fucked up. Plus the occasional ignoring/payback texts.

In the past I tried to show her how sorry I felt, but the last time that happened she said "it's more of me trying to comfort you rather than you comforting me." It was a big hit on my pride so from then on I just hid everything from her to show nothing was wrong because I cared that much about her didn't want her to feel that way.

Recently I had to go to work early in the morning to drive out of state for a study our company was conducting. Have been busy all day and tried to talk to her as much as I could (which wasn't enough). Since it went well my boss wanted to celebrate by buying us dinner. I tried to text her about the success and such and seeing how she was doing, but my texts weren't very long and short (according to her). I told her I was having dinner with my co-workers but probably didn't communicate how important it was (since there was another representative judging our company).

Is she just expecting the right amount and I myself need to do a better job? I'm afraid if I bring it up it'll just eventually feel like me just doing a poor job and nothing I say is really justifiable. 

Before I was able to shrug it off, but after working basically three 60/hr weeks and two weekends in a row, this one just hit really hard.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Put forth a lot of effort, whenever things go bad I feel guilty and she gets mad. What else can I do to make it better?