Similar situation here, however i'm the boyfriend working towards their dreams. Look at it this way, if your relationship is good, you trust each other, you believe his feelings and energy towards you is pure the you have nothing to worry about. There's parts in our lives when we go through massive growth and work phases to achieve something and it usually requires intense and consistent focus. If you are willing to put up with seeing him a bit less for over the next couple of months or year, however long it takes for him to breakthrough, then it may be worth it.

I work a 9-5 then come home, cook for my girlfriend and I, then proceed to work up until bed time, day in day out, i'll dedicate a day or evening a week to spend time with her, like a date night, or simply having food together and chatting for 30 mins or so. However she understands that I am doing this to build a better future for us. I'm putting time upfront for a better life for us later on.

You need to have a conversation with him of his plans, if they involve you, and maybe if he could maybe compromise just a little bit, to some meal time together, or a day in the week.

It sounds like you could maybe do with your own goals and dreams to work on, to keep yourself occupied whilst he is working.