Honestly, I don’t think it’s a bad idea at all.
You’re not choosing it just because of him ..you said yourself you genuinely love the course and the campus, and that’s the most important thing. If it’s right for you academically and personally, then the fact your boyfriend is at the same uni is just an extra, not the reason.
Also, being at the same uni doesn’t mean you’re “copying” him or getting in the way of his life, especially if you’re on different campuses. You’ll still both have your own space, your own friends, and your own uni experience. It actually sounds like quite a healthy balance — close enough to see each other, but not so close that you’re living on top of each other.
I think the bigger question is whether you’d want this uni if he wasn’t there. And from what you’ve said, it sounds like yes. So don’t talk yourself out of something good just because you’re worried how it looks.
At the end of the day, people will always have opinions, but they’re not the ones living your life. Choose the place that feels right for you. If that also means being nearer to someone you care about, that’s not a weakness — that’s just life.