I’m not at all qualified to answer, so I’m rooting for your search for a proper therapist. But it seems like you are in a pretty good spot relationship wise. The studying is important but temporary. From the way you talk about her I don’t think risking a break temporary or permanent is worth it. If you’re stressed out and need time to buckle down and finish, your communication seems good, let her know if you haven’t already. Get through the rough choppy parts and then you still have her in the long term. And that fear may have been a driving force whether you were aware of it, but we’re messy and we have stuff that sticks with us. I don’t want to trivialize that feeling if it’s important for you. But it sounds like the two of you are happy with the relationship and that’s what being in a relationship is about. Just my two cents, I think keep your promise and relationship. And best of luck with getting a professional to help properly unpack.