I recently finished up my first year at a PhD program. Everything seemed to be going really smoothly. I chose a program that I absolutely love, I work with the professor I want to doing something that I really enjoy, and I managed to get summer funding.
Despite this, it seems like I really screwed up and I'm not sure how to fix it. Before getting summer funding, I briefly talked to my PI about applying for summer jobs. I applied to a few and then forgot about it once I found out I would be funded for 20 hours over the summer. Right after the semester finished up, I ended up getting a position with a company. It was a research position and it seemed like the perfect opportunity to gain new skills and earn extra money (as it is impossible to live off of working 20 hours a week). I knew it would be a lot, but I didn't think much of it as people work multiple jobs all the time and I was assured that my schedule would be flexible (and it is very flexible for both jobs). I mentioned it in passing that I would be working with this company over the summer (and he even provided a recommendation). I have been working both jobs for over three weeks now. Today, my hours with the company came up with my PI somehow, so I told him, thinking nothing of it. When he found out that it was full time, he was clearly very angry.
I obviously screwed up by taking a full time position on top of my work with him without discussing it with him first. I really didn't mean to be deceitful. I wanted to do well and take as many opportunities as possible. I replied and apologized profusely. I said that I would remove myself from he company if I need to as well. I haven't heard back yet. I don't think anyone can give me some magic solution on how to fix this, but right now I am terrified that he is going to dismiss me from my position.