I'm assuming you've been or are still at uni, and have experienced freshers' week for yourself.
How would you have responded to someone who had their other half tagging along all the time? It's difficult trying to talk to someone when their non-uni partners are around, a) because you don't know if the partner would be suspicious of your motives, and b) the person clearly values their partner over socialising and making friends.
I had an extremely awkward moment last year, where I became fairly good friends with a girl from the flat next door, but when her boyfriend found out we were mates, he began facebook-stalking me, leaving me weird, vaguely threatening messages, which didn't even stop when I told him I was actually gay, so he had no worries as far as her friendship with me was concerned.
The occasional visit is fine, but being there the whole of freshers week is going to be awkward, and is unreasonable of you to demand, imho.