So I'd be curious to hear how other couples deal with career decisions. Are you supportive of the occasional crazy career move? Or once you're half of two, is it necessary to be a bit more responsible? Also, maybe he's right and I am being crazy... so I'd be interested to know if other people think that.
It depends what you mean by "responsible". Ultimately, what you want is being happy rather than miserable. Any money we might be saving is only to make sure we won't be miserable later... but if it's only to be miserable now, there is really no point.
How much would your change of career afect him? Is the pay difference really huge? I can understand his concern if he's afraid you'll have to live on his paycheque rather than yours, especially if he also dislikes his career and feels like you'll end up doing something you like, but he'll have to keep doing something he doesn't like so you can make ends meet.
Ultimately, there is a money issue, if you both went into something that doesn't bring an income, you'd be screwed.
If the pay difference isn't big enough, if it's only about status, then that's different.
It's your life. A lot of people have these concepts about how you're better than others if you have a high diploma, and you have to do grand things. Screw them. Do something you like. If they weren't able to have a diploma and you were, too bad for them. You're not going to do something just because they can't. You don't have to, certainly not. And whatever you do, it's not like you're losing your diploma anyways, you still have it.
If your boyfriend is worried that your status won't be acceptable to him, I'd worry about changing boyfriends more than changing careers. I mean, he should be caring about your happiness, not about what other people might say about him because he's with you.
You're not asking to be completely dependent on him (which I am on my husband right now, so I can tell you, it's not the same thing at all). You want to be allowed to decide what to do for a living.
It's your life, it's your choice. I don't even understand why you'd need his opinion.
Now, the only thing is to be sure about your decision. It's possible that you'd end up equally as unhappy somewhere else. You need to be really sure that the career change would make you happy, and not just change every time you dislike a job. It's normal to dislike what you do to some extent, I mean, that's why they call it work, not fun. But you should feel that you're going somewhere. That you're accomplishing something. If you don't, then what's the point in living to begin with?
I think it's a personal decision you have to make for yourself. It shouldn't affect him, unless you start needing to borrow money from him constantly or something.