If his actions in the relationship do not track the crap that he spews - does it matter who he follows on Instagram?

I am just trying to picture this conversation in person if my friend told me that they broke up with their partner because they follow someone on Instagram. My intuition would be to laugh at them.

That said, it sounds like a progression of problems in the relationship beyond this but without actually hearing what the other mistakes are, it would be unfair to judge those and if you are unhappy - it is time to move on.

I’m studying to be a doctor. My independence, intelligence, and career ambitions are all central to my character.

Does anyone else see this as a bit pretentious? OP is 20 and is likely in a pre-med program for undergrad - if you aren't in medical school, you aren't "studying to be a doctor". You are studying to attempt to get into medical school (unless you have fast tracked and are in med. school at 20) - they are very different things. Regardless, I am not sure how this is relevant and it comes across as trying to self aggrandize.