Happy relationship of 2 years, boyfriend is undergoing a lot of stress and suddenly wants to break up? What do I do?

Anonymous
We are 22 years old and have been dating for 2 years. I am being honest when I say our relationship has been completely wonderful and we have both been very happy. My boyfriend has always worked a lot, but he always made time when he could to come over, to visit me at school (an hour away), to call me, text me, etc. He has always made me a priority among his other priorities.
Recently, I graduated from college and moved back home to the same town as him. He picked up another job and started school, so his days are very long. He works ALL day, or goes to school all day. Lately he has been picking up extra shifts at work that are overnight, making his work day 20 hours long. At first, I would get mad at him for being so busy and not trying to see me, especially now that I live closer to him. It was hard for me because I wasn't used to that- he ALWAYS made time for me no matter what.
He started acting distant as soon as school started, and I know me getting mad didn't help with the stress. I apologized and became more understanding. But over that next week, things started to go downhill.
I asked if we were okay and he said no. I called him and we talked for 2 hours. Basically, he was offered an interview for his dream job in a city 3 hours away. He always said that was his plan in the future, he even said last week he wouldn't take it now. He wanted to wait. But all of a sudden, he feels pressured, like he was to take this job now or he's never going to get it again. He's pressured to figure out his life and future all of a sudden. To cope with the stress, he is burying himself with work to distract himself and feel like he's doing something he "should." He does this when he gets stressed, he works too much, but it usually passes with him. He always works a lot, he always has during our relationship, but he always made time for other things too. Now, with the stress, he doesn't make time for anything but work.

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He also is acting like he isn't sure he wants to continue the relationship. I don't understand because we were SO happy. Just 2 weeks ago, he was calling me at night even though we were texting just to talk, we were talking about vacation plans for the summer, we had dinner with my family and he said he had a good time, he was posting pictures of me on social media about how proud he is of me and how beautiful I am. I just don't understand how he could not want that to continue?
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I told him I would be more understanding of his busy schedule and that I wanted to work things out no matter what. He said he wasn't sure we wanted the same thing even after I told him we did. He said he wasn't ready to move in together, even though he was the one that would sit next to me and look at apartments and bring it up on his own. He said he didn't know if he could see himself marrying me, when we casually talked about it before. I think his stress is bringing up commitment issues that
Happy relationship of 2 years, boyfriend is undergoing a lot of stress and suddenly wants to break up? What do I do?
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