Going to the same uni as your sixth form girlfriend is objectively a bad idea, right?

[Roundaboot]

Or am I overreacting as DS would have me believe?
DS is in year 13 as is his girlfriend. They've been together since the start of sixth form and she's a lovely girl - clever, interesting and polite. She and DS have a good relationship very supportive and respectful and they have similar interests. However they do spend a LOT of time together which has caused me some concern.
And now they have revealed that they've applied for the same uni to do the same course. This was DS's second choice but has been gaining favour as it was becoming less likely that he'd get the grades for his first choice so it's likely he'll go there.
We had a row this morning as I pointed out it might not be the best idea. My concern is they'll spend 24/7 together, leaving no time for new friends and experiences. And I'm worried they'll just get too dependent on each other.
Am I right to be worried? I will back off DS now that I've made my feelings clear as I don't want to add more stress when he's already feeling it, but curious to know others' thoughts and experiences

It doesn't need to be a bad thing. I also don't think that spending most of your time with your girlfriend is a bad thing.

I met my DH 6th form and we went to the same uni - we never lived together, and formed our own friendships, went out with our mates. Even if we saw the other one on a night out, it was a kiss and bye have a gd eve. We had a few rocky moments but neither met someone else, been together 20 years. Don't stress about it!

@Roundaboot Centuries ago, my 1st love and i both went to the same uni (but different colleges). We met at 6th form and dated for nearly 3 years. He went to uni straight after A levels and i took a year out. We remained a couple during his first year and then he finished with me about 1 month before i was due to start. (Which he was perfectly entitled to do at 19!).

The first term was hard for me. We were at different colleges but doing very similar subjects (MFL but different languages) and ran into each quite other a lot around the campus. But by the middle term, we had settled into a very comfortable friendship and were able to enjoy each other’s company without stress. It was great as we had always got on well and it was great to rediscover that friendship. Because we were both MFL students doing a 3rd year abroad, my first year was the only year we overlapped. Which is to say that it all worked out fine even though we did split up!

leave it not your business and not worth the fight, you will just make things worse