"he just says he would miss me and be intensely bored and boredom leads to frustration and resentment."
Wow, that's incredibly needy and passive aggressive.
You've been dating for a couple of months but he would be "intensely bored" without you?
I don't care how many hobbies he has, someone so lacking in personal resources that they are intensely bored when their girlfriend goes away is a bit of a loser.
And as for the little veiled threat about what might happen if he gets frustrated and resentful? 
When I am cuddled up with my DH and DDs, feeling DC3 kick the shit out of my cervix, I am so glad that I took the opportunity DH encouraged me to take and that as well as my family I have an interesting and fulfilling career.
There should be no either/or here.
The only way this turns about to be a choice between man and job is if man doesn't measure up.
You're only 24 - the last thing you need at this stage of your life is a boyfriend who would hold you back so he isn't bored.
Really - his boredom is his problem.
It would be an act of unmitigated folly to give up an opportunity like this to fix his boredom.