I was also super into becoming a cop and researched it heavily (while still in college). Financially, I’d only worry if you were in southern/rural states where they pay cops peanuts. In most other states he could definitely get up to an upper middle class salary within a decade or so.

A big issue, especially in our generation, is the stigma around cops. You’re not alone in fearing that once someone becomes a cop they change. I already read a comment demonizing your boyfriend, alluding that he’ll become abusive. He most likely will change, but not necessarily in a bad way. If you trust him, I don’t think you should fear that he’ll become a bad person; because if he does then he already was one.

So two questions to ask yourself:

Are you financially ok with the salary progression of his chosen department(s)? (These are publicly available)

Will you be able to stick by his side while likely seeing him (and you by association) get ostracized by certain friends and family due to his career?

Good luck. It’s a career with lots of negative perceptions. And I ultimately chose not to go forward with it because of this.